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1.
The Stark effect of CH3F is extensively used as a calibration standard in laser Stark spectroscopy. The accepted value for the dipole moment of the ground vibrational state of CH3F is less accurate than the precision of laser Stark measurements, and questions have also been raised about the literature value. New molecular beam spectroscopy measurements have been made of the ratio of the Stark effect in the J = 1, K = 1 and J = 2, K = 2 CH3F states to that of the 0110 vibrational state of OCS. The results were and . This produces a dipole moment of 1.85840 D with precision relative to OCS of 10 ppm and absolute accuracy of 43 ppm. 相似文献
2.
A frequency tunable infrared source has been constructed by using the (Ar-laser) - (dyelaser) difference frequency method developed by Pine and applied to the observation of the overtone bands of PH3 3ν2 ← 0 and 4ν2 ← ν2 in the 3.4 μm region and 4ν2 ← 0 in the 1.6-μm region. A Stark modulation method was used to increase the sensitivity of detection. For transitions which were well modulated, the minimum detectable absorption coefficient was estimated to be ~3 × 10?7 cm?1 using a 3-m cell. Emphasis was placed on the observation of the A1-A2 splitting for K = 3n rotational levels. For the 3ν2 state splittings were observed for K = 3, 6, and 9 because PH3 is a very nearly spherical top in this state. The magnitude and the J dependence of the observed K = 3n splittings have been analyzed by using a normal symmetric rotor Hamiltonian and a centrifugal distortion term of the form . 相似文献
3.
For the model at T = 0 four susceptibilities have been calculated exactly on a sequence of finite square lattices and extrapolated to the infinite square lattice. For the ferromagnet χzz = 0 while χxx ~ N2.9; for the antiferromagnet and . 相似文献
4.
A millimeter-wave spectrometer having a sensitivity of 4 × 10?10 cm?1 in the 2-mm region has been constructed for observation of extremely weak millimeter-wave spectra of gases. It has been used to measure J → J, K = 0 ← 3 transitions in PH3 and J → J, K = 0 ← 3 as well as K = ±1 ← ±4 transitions in PD3. The B0 and C0 spectral constants (in MHz) are: for PH3, B0 = 133 480.15 ± 0.12 and C0 = 117 488.85 ± 0.16; for PD3, B0 = 69 471.10 ± 0.03 and C0 = 58 974.37 ± 0.05. The effective ground-state values obtained for the bond angle and bond length are: for PH3, and ; for PD3, and . The corresponding zero-point-average values were calculated to be: for PH3, and ; for PD3, and . For both species, the equilibrium values are and . 相似文献
5.
The magnetic hyperfine splitting νM = |gμNBHF/h| of ; in Fe has been measured with the technique of nuclear magnetic resonance on oriented nuclei as 320.4(1) MHz. With the known hyperfine field the magnetic moment of the ground state of 175Ta is deduced to be . 相似文献
6.
The magnetic hyperfine splitting vM=|gμNBHF/h| of 196mAu (jπ=12?; configuration ¦(π(; as dilute impurity in Ni has been determined with nuclear magnetic resonance on oriented nuclei as 96.0(2) MHz. With the known hyperfine field BHF = ?264.4(3.9) kG corrected for hyperfine anomalies the g-factor and magnetic moment of 196mAu are deduced to be |g| = 0.476(7) and |μ| = 5.72(8) μN. Taking into account the known magnetic properties of and isomeric states in the neighbouring odd Pt, Au and Hg nuclei the structure of the 12? state is discussed. 相似文献
7.
Molecular beam electric resonance spectroscopy has been used to measure the l-type doubling transitions in carbonyl sulfide. Transitions in J = 4 to J = 20 have been observed for the (0220) vibrational state and for J = 1 and J = 2 for the (0310) state. The data has been analyzed to give the v = 2 energy separation , and the vibrational dependence of q to be 86.52(9)(v2 + 1) KHz. The dipole moment of the (0220) vibrational state is 0.6936(3) D. 相似文献
8.
J. Leotin J.C. Ousset R. Barbaste S. Askenazy M.S. Skolnick R.A. Stradling G. Poiblaud 《Solid State Communications》1975,16(4):363-366
The first observation of cyclotron resonance in n-type GaP is reported. The electrons were thermally excited at a temperature of 100 K and the resonance was observed at submillimetre wavelengths (337 μm) using a pulsed magnetic field of 0–300 kG. From experiments with B∥〈100〉, 〈110〉 and 〈111〉 it was found that the transverse effective mass for electrons is and that the anisotropy factor for the conduction band ellipsoids is K = 20+10-6. 相似文献
9.
Nearest neighbour anisotropic exchange is characterized by for a bond along the x-axis. For J6 = ?J⊥ < 0 the ground configuration of the total exchange hamiltonian is a two-sublattice antiferromagnet which is an eigenstate of the problem. 相似文献
10.
The magnetic hyperfine splitting νM = |gμNBHF/h| of ; as a dilute impurity in Ni has been measured with nuclear magnetic resonance on oriented nuclei as 226.4(2) MHz. With the known hyperfine field BHF = ?264.4(3.9) kG corrected for hyperfine anomalies the g-factor and magnetic moment of 193mAu are deduced to be |g| = 1.123(17) and |μ| = 6.18(9) μN. 相似文献
11.
12.
Mössbauer spectra were obtained of the paramagnetic spinels and susceptibilities were measured. The strong difference between the paramagnetic Fe2+ and Fe3+ spectrum, due to the different quadrupole splitting, is used for the distinction between the two species. At 300 K a superposition of the Fe3+ and the Fe2+ spectra is found for most of the iron and, in addition, some continuous absorption. The latter is strongest for equal Fe3+ and Fe2+ concentration while it disappears towards the end members (Fe3+ only or Fe2+ only) as well as with decreasing temperature (between 78 and 200 K). From this it is concluded that it arises from thermally activated electron exchange, the frequency of which passes a “critical” value of ~108 sec?1 for increasing temperature. Paramagnetic susceptibilities are found to obey a Curie-Weiss law down to low temperatures. From the dependence of the asymptotic Curie temperature on the composition the magnetic interaction parameters J11 = ?1.4 K, J22 = ?3.3 K and J12 = + 1.6 K for the Fe3+Fe3+, Fe2+Fe2+ and Fe3+Fe2+ interactions are derived. The experimental results are discussed in terms of a hopping model with an activation energy q ~- 0.12eV and a non-equivalence of the octahedral sites expressed by a varying potential energy difference U0 between neighbouring sites. The continuous absorption at 300 K for is attributed to about 17% of the iron on sites with U0 running from 0 to ??0.06 eV. The ferromagnetic Fe3+, Fe2+ interaction (J12) is attributed to electron transfer from localized Fe2+ ions to Fe3+ neighbours via a transfer integral b of the order of 0.05 eV. The magnitudes of J12 and b are tentatively explained. 相似文献
13.
The microwave spectrum of MnO3F has been remeasured and several corrections and new results have been obtained: B0 = 4129.141 MHz, DJ = 1.12 kHz, DJK = 1.87 kHz; , , , |q5| = 16.005, and |q6| = 8.456 MHz. 相似文献
14.
B.P. Antonyuk 《Solid State Communications》1978,25(12):971-975
A possibility of the central peak appearance in crystals with low concentration of small-radius polarons is pointed out. The intensity of the central peak increases sharply with the softening of the phonon mode in the vicinity of the structural phase transition . The peak width γ0 is determined by the probability W of the polaron hopping between the sites γ0 = K02a2W. 相似文献
15.
EPR of 61Ni+ doped CuGaS2 at 4.2 K leads to the following experimental data: . High axial field splitting of 2T2 state stabilizes the center against Jahn-Teller interaction. Covalency reduction factor k is 0.76. 相似文献
16.
W. Steffen H.-D. Gräf W. Gross D. Meuer A. Richter E. Spamer O. Titze W. Knüpfer 《Physics letters. [Part B]》1980,95(1):23-26
The search for magnetic dipole transitions from the ground state-even Ca isotopes to high lying Jπ=1+ states by means of low momentum transfer but high resolution inelastic electron scattering is described. The previously detected strongly excited Jπ=1+ state EX=10.319 MeV [B(M1)↑=1.12±0.27μK2] in 40Ca has been confirmed, but - contrary to the expectations of the independent particle shell model - only a fairly weak M1 transition is observed in and none in 44Ca between EX=8.2?12.2 MeV. In 48Ca, however, a very strong M1 transition [B(M1) ↑ = 4.0 ± 0.3 μ2K] to a single state at EX=10.227 MeV has been discovered. 相似文献
17.
The probability distribution calculated for the decay sequence passing through the (JPN) = (2+, 1) intermediate state 12C1 (16.11 MeV) is cast in a symmetrical form and used to calculate the likelihood for on the basis of the 85 examples available for this decay process. This procedure has optimum sensitivity, is free from the uncertainties of the comparisons previously made using only projected angular distributions, and strongly indicates that JP = 1? holds for 12ΛB(g.s.). An appendix points out that all the data for the decay sequence passing through the (JPN, T) = (1+, 0) level of 12C1 is well fitted for J = 1 if the J = 1 → Jn = 1 transition amplitude as1 takes a value in the range as1/s = 0.08 to 0.09. 相似文献
18.
Intensities were measured at high pressure (200 Torr) for blended K-multiplets in the P and R branches of the s0 → aν2 and a0 → sν2 bands of 14ND3. Intensities of 55 individual lines at 10 Torr of 15ND3 were also measured by deconvolution of the true line shape from the observed vibration-rotation spectrum and the instrumental line shape. From these results we estimate a transition moment of 0.179 ± 0.010 D for both 14ND3 and 15ND3. These lead to a derivative of the dipole moment, . 相似文献
19.
L Nemes 《Journal of Molecular Spectroscopy》1978,72(1):102-123
Medium resolution infrared grating spectra of gaseous ketene, H2CCO were recorded between 1000 and 400 cm?1, both at instrument temperature (40°C) and with cooling (?40°C). Interferometric Fourier spectra were also measured at ?70°C with resolution 0.22 cm?1 between 450 and 330 cm?1. The K structure of the fundamentals ν5, ν6, ν8, and ν9 was assigned. These fundamentals are coupled by a-axis Coriolis interactions. These couplings were analysed on the symmetric top basis for setting up the perturbation matrix and by utilizing the K-dependent Coriolis shifts of levels. A preliminary analysis of the Coriolis intensity anomalies was also undertaken.Band center values from combination differences are and . Synthetic spectra indicate the band origins of ν8 and ν9 to be close to 977.8 and 439.0 cm?1, respectively. Estimates of Coriolis coupling constants obtained from synthetic spectra are , , , and . Approximate ratios of unperturbed vibrational transition moments obtained from spectral simulations are . 相似文献
20.
The ground-state spectroscopic quadrupole moments of and have been determined by nuclear orientation as +2.2(4) b and ?2.03(3) b, respectively. The negative QM of 185Ir can be explained only by a ground-state configuration. The positive QM of 184Ir implies K ? 4 in contradiction to expectations of K=0, 1 in analogy to 186Ir. 相似文献