The rotation-inversion spectrum of ketenimine,H2CCNH

High-resolution measurements of μ_c-type transitions of ketenimine in the 4- to 7-GHz region revealed a splitting of each line caused by the inversion motion of the imino hydrogen. The inversion splitting amounts to 66 kHz. Data from ab initio molecular orbital calculations for the changes of the geometrical parameters during the inversion motion have been used to carry out semirigid bender calculations. A barrier height of 4700 ± 200 cm⁻¹ and an equilibrium HNC angle of 115.4 ± 0.6° have been derived. In addition, the microwave spectrum of the N-deuterated species has been assigned. The inversion splitting could not be resolved but the quadrupole coupling of the deuterium nucleus has been observed. Attempts to detect the inversion splitting in methanimine, H₂CNH, have been unsuccessful, suggesting a higher barrier than in ketenimine.     

The microwave spectrum of the pyramidal isomer of disulfur difluoride: SSF2

The pyramidal isomer of disulfur difluoride, SSF₂, has been prepared by passing gaseous disulfur dichloride through heated potassium fluoride. The microwave spectra of three isotopic species of SSF₂ have been measured in the 26- to 76-GHz frequency region. For the most abundant isotopic species transitions with J values up to 79 have been observed. These data have been combined with previous measurements of low-J lines by R. L. Kuczkowski [J. Amer. Chem. Soc. 86, 3617–3621 (1964)] and fit to obtain values for the rotational constants and centrifugal distortion constants. The quartic centrifugal distortion constants have been used together with existing vibrational data to determine an harmonic force field for the molecule. Finally, ground state average and equilibrium structures have been calculated for SSF₂.     

The microwave spectrum of the transient molecule chloro(sulphido)boron,ClBS: Substitution structure,dipole moment,quadrupole moment,and vibration-rotation analysis

The rotational spectrum of the new reactive triatomic molecule chloro(sulphido)boron, ClBS, produced by the high-temperature reaction of gaseous dichloro disulphide, Cl₂S₂, and crystalline boron at ca. 1000°C was studied by microwave spectroscopy between 26.5 and 40 GHz. Ground state rotational constants have been obtained for 11 of the 12 isotopic variants involving ³⁵Cl, ³⁷Cl, ¹¹B, ¹⁰B, ³²S, ³³S, and ³⁴S; the isotopic shifts for the ground state lines of ³⁵Cl¹⁰B³⁴S from those of ³⁵Cl¹¹B³⁴S are too small and they are overlapped by the ¹¹B species. The abundance of rotational constant data has allowed a detailed comparison of various structure determination procedures to be made. The substitution method yields an extremely consistent ClS distance of 3.28715 ± 0.00005 Å. Application of the first moment condition allows the B atom, which lies close to the center of mass, to be quite accurately located. The resulting bond lengths are $\text{r(}\text{ClB}\text{) = 1.681 ± 0.001}\text{A}\text{?}$ and $\text{r(}\text{BS}\text{) = 1.606 ± 0.001}\text{A}\text{?}$. The more important derived spectroscopic parameters are:

     

5.

The sub-millimeter and Fourier transform microwave spectrum of HZnCl (X Σ)     

R.L. Pulliam 《Journal of Molecular Spectroscopy》2009,257(2):128-17192

The pure rotational spectrum of HZnCl (X ¹Σ⁺) has been recorded using sub-millimeter direct-absorption methods in the range of 439-540 GHz and Fourier transform microwave (FTMW) techniques from 9 to 39 GHz. This species was produced by the reaction of zinc vapor and chlorine gas with H₂ or D₂ in a d.c. glow discharge for the sub-millimeter studies. In the FTMW measurements, HZnCl was created in a discharge nozzle from Cl₂ and (CH₃)₂Zn. Between 5 and 10 rotational transitions were measured in the sub-millimeter regime for four zinc and two chlorine isotopologues; four transitions were recorded with the FTMW machine for the main isotopologue, each consisting of several chlorine hyperfine components. The data are consistent with a linear molecule and a ¹Σ⁺ ground electronic state. Rotational and chlorine quadrupole constants were established from the spectra, as well as an r_m⁽²⁾ structure. The Zn-Cl and Zn-H bond lengths were determined to be 2.0829 and 1.5050 Å, respectively; in contrast, the Zn-Cl bond distance in ZnCl is 2.1300 Å, longer by ∼0.050 Å. The zinc-chlorine bond distance therefore shortens with the addition of the H atom. The ³⁵Cl electric quadrupole coupling constant of eQq = −27.429 MHz found for HZnCl suggests that this molecule is primarily an ionic species with some covalent character for the Zn-Cl bond.     

6.

The far-infrared rotational spectrum of X2Π OH     

《Journal of Molecular Spectroscopy》1986,115(1):226-228

     

7.

The principle of primary spectrum pyrometry   总被引：2，自引：0，他引：2  

CHENG Xiaofang  FU Tairan & FAN Xueliang Department of Thermal Science  Energy Engineering  University of Science  Technology of China  Hefei  China 《中国科学G辑(英文版)》2005,48(2)

1 Introduction Planck Law[1] is the fundamental of radiation temperature measurements, which in- dicates the quantitative relationship between the radiation intensity and the temperature of ideal blackbody.wherewhere C1 is Planck first constant, C2 Planck second constant, λ the wavelength, ε the spectral emissivity of an actual surface, I = ε (λ, T, θ, φ, β), Ib(λ, T) the radiation distri- bution of the real surface, λ1 the lower limit wavelength, λ2 the higher limit wavelength, d…     

8.

The FT absorption spectrum of 13CH12CH: rotational analysis of the vibrational states from 3800 to 6750 cm−1     

E. Cané  L. Fusina  A. Fayt  M. Herman  S. Robert 《Molecular physics》2013,111(4):515-526

Thirty four cold bands and 37 hot bands are reported from the high resolution FT absorption spectrum of ¹³CH¹²CH, all leading to vibrational states located between 3800 and 6750?cm^?1. Each band has been vibrationally assigned and rotationally analysed. The band centres and rotational constants are listed.     

9.

The microwave response of MgB2 /Al2O3 superconducting thin films          下载免费PDF全文

史力斌  王云飞  柯于洋  张国华  罗胜  张雪强  李春光  黎红  何豫生  于增强  王福仁 《中国物理》2007,16(3):799-804

Microwave characteristics of MgB2/Al2O3 superconducting thin films were investigated by coplanar resonator technique. The thin films studied have different grain sizes resulting from different growth techniques. The experimental results can be described very well by a grain-size model which combines coplanar resonator theory and Josephson junction network model. It was found that the penetration depth and surface resistance of thin films with smaller grain sizes are larger than those of thin films with larger grain sizes.     

10.

Production of CH （A2△） by multi-photon dissociation of （CH3）2CO,CH3NO2, CH2Br2, and CHBr3 at 213 nm          下载免费PDF全文

李胜强  许亮  陈扬骎  邓联忠  印建平 《中国物理 B》2014,(8):327-332

In order to realize electrostatic Stark deceleration of CH radicals and study cold chemistry, the fifth harmonic of a YAG laser is used to prepare CH(A2△) molecules through using the multi-photon dissociation of(CH3)2CO, CH3NO2, CH2Br2,and CHBr3 at ～ 213 nm. The CH product intensity is measured by using the emission spectrum of CH(A2△→ X2Π). The dependence of fluorescence intensity on laser power is studied, and the probable dissociation channels are analyzed. The relationship between the fluorescence intensity and some parameters, such as the temperature of the beam source, stagnation pressure, and the time delay between the opening of pulse valve and the photolysis laser, are also studied. The influence of three different carrier gases on CH signal intensity is investigated. The vibrational and rotational temperatures of the CH(A2△) product are obtained by comparing experimental data with the simulated ones from the LIFBASE program.     

11.

The high-resolution infrared spectrum of HBF2: The 401 band near 926 cm−1     

《Journal of Molecular Spectroscopy》1986,116(1):143-166

The type-C out-of-plane bending fundamental ν₄ (near 926 cm⁻¹) in the infrared spectrum of gaseous difluoroborane, HBF₂, has been recorded at high resolution. Rotational and centrifugal distortion constants have been obtained for the two isotopic species H¹⁰BF₂ and H¹¹BF₂ in both the ground and 4¹ levels. A small rotational perturbation in the 4¹ level of H¹¹BF₂ has allowed an estimate of the position of the ν₆ fundamental, which so far has not been observed directly.     

12.

The high-resolution infrared spectrum of HBF2: The 201 band near 1164 cm−1     

《Journal of Molecular Spectroscopy》1987,122(1):135-149

The type-B totally symmetric stretching fundamental ν₂ (near 1164 cm⁻¹) of difluoroborane has been recorded. Rotational and centrifugal distortion constants have been evaluated for the two isotopic species H¹⁰BF₂ and H¹¹BF₂, in both the ground and 2¹ levels. The spectrum has been found to be regular, with no perturbations and no new information on the position of the missing fundamental ν₆.     

13.

The infrared spectrum of gaseous cis-d2-ethylene below 1400 cm−1     

《Journal of Molecular Spectroscopy》1987,126(1):32-57

Three infrared active fundamental bands of cis-d₂-ethylene have been studied at a resolution of ca. 0.030 cm⁻¹: the type-c band ν₇ and the two type-a bands ν₆ and ν₁₂. From a simultaneous analysis of infrared ground state combination differences due to ν₇ together with microwave measurements, a set of ground state rotational and centrifugal distortion constants has been obtained. For all three bands upper state spectroscopic constants are determined, and perturbations are identified. The K′_a = 4 level in ν₇ is perturbed locally by a higher order c-Coriolis resonance with ν₈. ν₆ is globally perturbed by first-order a-Coriolis resonances with ν₄ and ν₈. For ν₁₂ a higher order c-type Coriolis resonance with 2ν₁₀ is of importance for several K_a levels, and the constants for ν₁₂ have been obtained taking this interaction into account. In addition, a Coriolis resonance parameter and some constants for 2ν₁₀ have been determined.     

14.

The infrared spectrum of HCCF around 17 μm     

R. Anttila  J. Kauppinen  H. Ruotsalainen 《Journal of Molecular Spectroscopy》1977,66(1):87-98

The absorption spectrum of HCCF in the region of the CH bending fundamental ν₄ has been studied at a resolution of about 0.03 cm^?1. In addition to the fundamental, the rotational analysis has been performed for six “hot” bands. Several molecular parameters have been derived. The effects of l-type resonances have been discussed. In particular, the influence of the resonance between the sublevels of ν₄ + ν₅ on the effective centrifugal distortion constants has been investigated.     

15.

The infrared spectrum of the Δv = 2 transitions of lead sulfide (PbS)     

《Journal of Molecular Spectroscopy》1987,125(1):188-195

     

16.

The spectrum of a quasiperiodic Schrödinger operator     

András Sütő 《Communications in Mathematical Physics》1987,111(3):409-415

The spectrum (H) of the tight binding Fibonacci Hamiltonian (H _mn= _m,n+1+ _m+1,n + _m,n v(n),v(n)= ((n–1)), 1/ is the golden number) is shown to coincide with the dynamical spectrum, the set on which an infinite subsequence of traces of transfer matrices is bounded. The point spectrum is absent for any , and (H) is a Cantor set for 4. Combining this with Casdagli's earlier result, one finds that the spectrum is singular continuous for 16.On leave from the Central Research Institute for Physics, Budapest, Hungary     

17.

The spectrum of operators elliptic along the orbits of ℝ n actions     

Jerome Kaminker  Jingbo Xia 《Communications in Mathematical Physics》1987,110(3):427-438

It is shown that a periodic elliptic operator on ⁿ has no eigenvalues off of the set of discontinuities of its spectral density function. The methods involve operator algebras and are based on a spectral duality principal first introduced by J. Bellisard and D. Testard. A version of the spectral duality theorem is proved which relates the point spectrum of a certain family of operators to the continuous spectrum of an associated family.Research sponsored in part by NSF grants     

18.

The ν2 infrared band of 1-phosphapropyne CH3CP     

《Journal of Molecular Spectroscopy》1987,124(1):82-91

The Fourier transform infrared spectrum of 1-phosphapropyne CH₃CP has been recorded in the region 1470–1580 cm⁻¹ with a resolution of 0.01 cm⁻¹, and the ν₂ band centered at 1558.7416(28) cm⁻¹ was analyzed. The 689 observed transitions with J′ and K′ values up to 69 and 8, respectively, were assigned. A set of the spectroscopic constants determined for the upper v₂ = 1 state reproduced the experimental wavenumbers with an rms error of 0.0025 cm⁻¹. No significant perturbations were observed. The ν₂ + ν₈ − ν₈ hot band, centered at 1553.5492(35) cm⁻¹, was also analyzed. The upper state constants determined from the 341 observed transitions with J′ and K′ values up to 53 and 6, respectively, reproduced the experimental wavenumbers with an rms error of 0.0047 cm⁻¹.     

19.

Fourier spectrum of CH3OH between 950 and 1100 cm−1     

《Infrared physics》1989,29(2-4):583-606

The infrared spectrum ofCH₃OH between 950 and HOOcm⁻¹ has been measured by a high resolution Fourier transform spectrometer. This spectral region is of particular interest because of its overlapping with the CO₂ laser emissions used for exciting the CH₃OH laser. A catalog of 3410 assigned lines is presented, as well as the Taylor development tables for evaluating the energies of the upper levels of the corresponding transitions.     

20.

The optical double resonance spectrum of the B̃1A1 state of Cl2CS     

《Journal of Molecular Spectroscopy》1986,115(1):74-81

     

	35Cl11B32S	35Cl10B32S	37Cl11B32S	35Cl10B32S
$\text{B}{}_0$	2796.7796(7)	2796.8613(14)	2722.9999(6)	2723.2127(17) MHz
$\text{D}{}_0$	344.0(8.0)	327.0(17.0)	321.0(7.0)	328.0(21.0) Hz
$\text{α}{}_2$	?7.4889(7)	?7.8745(15)	?7.2941(15)	?7.6742(17) MHz
$\text{α}{}_3$	3.4620(2)	3.7731(4)	3.4755(2)	3.6354(3) MHz
$\text{q}{}_2$	1.9942(9)	1.9160(7)	1.8954(7)	1.8190(7) MHz
$\text{eQq}\text{(Cl)}$	?42.54(1)	?42.56(2)	?33.53(1)	?33.58(3) MHz
μ	1.45(8)	—	—	— D

The sub-millimeter and Fourier transform microwave spectrum of HZnCl (X Σ)

The pure rotational spectrum of HZnCl (X ¹Σ⁺) has been recorded using sub-millimeter direct-absorption methods in the range of 439-540 GHz and Fourier transform microwave (FTMW) techniques from 9 to 39 GHz. This species was produced by the reaction of zinc vapor and chlorine gas with H₂ or D₂ in a d.c. glow discharge for the sub-millimeter studies. In the FTMW measurements, HZnCl was created in a discharge nozzle from Cl₂ and (CH₃)₂Zn. Between 5 and 10 rotational transitions were measured in the sub-millimeter regime for four zinc and two chlorine isotopologues; four transitions were recorded with the FTMW machine for the main isotopologue, each consisting of several chlorine hyperfine components. The data are consistent with a linear molecule and a ¹Σ⁺ ground electronic state. Rotational and chlorine quadrupole constants were established from the spectra, as well as an r_m⁽²⁾ structure. The Zn-Cl and Zn-H bond lengths were determined to be 2.0829 and 1.5050 Å, respectively; in contrast, the Zn-Cl bond distance in ZnCl is 2.1300 Å, longer by ∼0.050 Å. The zinc-chlorine bond distance therefore shortens with the addition of the H atom. The ³⁵Cl electric quadrupole coupling constant of eQq = −27.429 MHz found for HZnCl suggests that this molecule is primarily an ionic species with some covalent character for the Zn-Cl bond.     

The principle of primary spectrum pyrometry

1 Introduction Planck Law[1] is the fundamental of radiation temperature measurements, which in- dicates the quantitative relationship between the radiation intensity and the temperature of ideal blackbody.wherewhere C1 is Planck first constant, C2 Planck second constant, λ the wavelength, ε the spectral emissivity of an actual surface, I = ε (λ, T, θ, φ, β), Ib(λ, T) the radiation distri- bution of the real surface, λ1 the lower limit wavelength, λ2 the higher limit wavelength, d…     

The FT absorption spectrum of 13CH12CH: rotational analysis of the vibrational states from 3800 to 6750 cm−1

Thirty four cold bands and 37 hot bands are reported from the high resolution FT absorption spectrum of ¹³CH¹²CH, all leading to vibrational states located between 3800 and 6750?cm^?1. Each band has been vibrationally assigned and rotationally analysed. The band centres and rotational constants are listed.     

The microwave response of MgB2 /Al2O3 superconducting thin films

Microwave characteristics of MgB2/Al2O3 superconducting thin films were investigated by coplanar resonator technique. The thin films studied have different grain sizes resulting from different growth techniques. The experimental results can be described very well by a grain-size model which combines coplanar resonator theory and Josephson junction network model. It was found that the penetration depth and surface resistance of thin films with smaller grain sizes are larger than those of thin films with larger grain sizes.     

Production of CH （A2△） by multi-photon dissociation of （CH3）2CO,CH3NO2, CH2Br2, and CHBr3 at 213 nm

In order to realize electrostatic Stark deceleration of CH radicals and study cold chemistry, the fifth harmonic of a YAG laser is used to prepare CH(A2△) molecules through using the multi-photon dissociation of(CH3)2CO, CH3NO2, CH2Br2,and CHBr3 at ～ 213 nm. The CH product intensity is measured by using the emission spectrum of CH(A2△→ X2Π). The dependence of fluorescence intensity on laser power is studied, and the probable dissociation channels are analyzed. The relationship between the fluorescence intensity and some parameters, such as the temperature of the beam source, stagnation pressure, and the time delay between the opening of pulse valve and the photolysis laser, are also studied. The influence of three different carrier gases on CH signal intensity is investigated. The vibrational and rotational temperatures of the CH(A2△) product are obtained by comparing experimental data with the simulated ones from the LIFBASE program.     

The high-resolution infrared spectrum of HBF2: The 401 band near 926 cm−1

The type-C out-of-plane bending fundamental ν₄ (near 926 cm⁻¹) in the infrared spectrum of gaseous difluoroborane, HBF₂, has been recorded at high resolution. Rotational and centrifugal distortion constants have been obtained for the two isotopic species H¹⁰BF₂ and H¹¹BF₂ in both the ground and 4¹ levels. A small rotational perturbation in the 4¹ level of H¹¹BF₂ has allowed an estimate of the position of the ν₆ fundamental, which so far has not been observed directly.     

The high-resolution infrared spectrum of HBF2: The 201 band near 1164 cm−1

The type-B totally symmetric stretching fundamental ν₂ (near 1164 cm⁻¹) of difluoroborane has been recorded. Rotational and centrifugal distortion constants have been evaluated for the two isotopic species H¹⁰BF₂ and H¹¹BF₂, in both the ground and 2¹ levels. The spectrum has been found to be regular, with no perturbations and no new information on the position of the missing fundamental ν₆.     

The infrared spectrum of gaseous cis-d2-ethylene below 1400 cm−1

Three infrared active fundamental bands of cis-d₂-ethylene have been studied at a resolution of ca. 0.030 cm⁻¹: the type-c band ν₇ and the two type-a bands ν₆ and ν₁₂. From a simultaneous analysis of infrared ground state combination differences due to ν₇ together with microwave measurements, a set of ground state rotational and centrifugal distortion constants has been obtained. For all three bands upper state spectroscopic constants are determined, and perturbations are identified. The K′_a = 4 level in ν₇ is perturbed locally by a higher order c-Coriolis resonance with ν₈. ν₆ is globally perturbed by first-order a-Coriolis resonances with ν₄ and ν₈. For ν₁₂ a higher order c-type Coriolis resonance with 2ν₁₀ is of importance for several K_a levels, and the constants for ν₁₂ have been obtained taking this interaction into account. In addition, a Coriolis resonance parameter and some constants for 2ν₁₀ have been determined.     

The infrared spectrum of HCCF around 17 μm

The absorption spectrum of HCCF in the region of the CH bending fundamental ν₄ has been studied at a resolution of about 0.03 cm^?1. In addition to the fundamental, the rotational analysis has been performed for six “hot” bands. Several molecular parameters have been derived. The effects of l-type resonances have been discussed. In particular, the influence of the resonance between the sublevels of ν₄ + ν₅ on the effective centrifugal distortion constants has been investigated.     

The spectrum of a quasiperiodic Schrödinger operator

The spectrum (H) of the tight binding Fibonacci Hamiltonian (H _mn= _m,n+1+ _m+1,n + _m,n v(n),v(n)= ((n–1)), 1/ is the golden number) is shown to coincide with the dynamical spectrum, the set on which an infinite subsequence of traces of transfer matrices is bounded. The point spectrum is absent for any , and (H) is a Cantor set for 4. Combining this with Casdagli's earlier result, one finds that the spectrum is singular continuous for 16.On leave from the Central Research Institute for Physics, Budapest, Hungary     

The spectrum of operators elliptic along the orbits of ℝ n actions

It is shown that a periodic elliptic operator on ⁿ has no eigenvalues off of the set of discontinuities of its spectral density function. The methods involve operator algebras and are based on a spectral duality principal first introduced by J. Bellisard and D. Testard. A version of the spectral duality theorem is proved which relates the point spectrum of a certain family of operators to the continuous spectrum of an associated family.Research sponsored in part by NSF grants     

The ν2 infrared band of 1-phosphapropyne CH3CP

The Fourier transform infrared spectrum of 1-phosphapropyne CH₃CP has been recorded in the region 1470–1580 cm⁻¹ with a resolution of 0.01 cm⁻¹, and the ν₂ band centered at 1558.7416(28) cm⁻¹ was analyzed. The 689 observed transitions with J′ and K′ values up to 69 and 8, respectively, were assigned. A set of the spectroscopic constants determined for the upper v₂ = 1 state reproduced the experimental wavenumbers with an rms error of 0.0025 cm⁻¹. No significant perturbations were observed. The ν₂ + ν₈ − ν₈ hot band, centered at 1553.5492(35) cm⁻¹, was also analyzed. The upper state constants determined from the 341 observed transitions with J′ and K′ values up to 53 and 6, respectively, reproduced the experimental wavenumbers with an rms error of 0.0047 cm⁻¹.     

Fourier spectrum of CH3OH between 950 and 1100 cm−1

The infrared spectrum ofCH₃OH between 950 and HOOcm⁻¹ has been measured by a high resolution Fourier transform spectrometer. This spectral region is of particular interest because of its overlapping with the CO₂ laser emissions used for exciting the CH₃OH laser. A catalog of 3410 assigned lines is presented, as well as the Taylor development tables for evaluating the energies of the upper levels of the corresponding transitions.