The 2ν1 + ν3 and 3ν3 bands of 14N16O2

The spectra of the 2ν₁ + ν₃ and 3ν₃ bands of ¹⁴N¹⁶O₂ have been recorded by means of high-resolution Fourier transform spectroscopy and have been extensively analyzed. The (2 0 1) and (0 0 3) rotational levels deduced from the analysis have been reproduced within the experimental uncertainty using a Hamiltonian which takes into account the Coriolis interaction coupling the vibrational states of the diads {(2 2 0), (2 0 1)} and {(0 2 2), (0 0 3)}. Finally, precise sets of vibrational energies, and spin-rotation, rotational, and coupling constants have been derived for these vibrational states.     

High-resolution investigation of the weak ν1+3ν21-ν21+ν3 band of CO2 around 2 μm

Fundamental spectroscopical parameters of the weak ν₁+3ν₂ ¹-ν₂ ¹+ν₃ band of CO₂ are reported using a high-resolution, direct-absorption spectrometer, based on a distributed feed-back diode laser emitting at 2 μm. Line intensities and self-broadening coefficients have been measured for the first time with high accuracy, for nine lines of the R branch, from R(44) up to R(59). Comparison with available data has been made, and a generally good agreement has been found. Received: 30 August 1999 / Published online: 24 March 2000     

The a2ν2 ← sν2 bands of 14NH3 and 15NH3

Numerous transitions belonging to the a2ν₂ ← sν₂ hot bands of ¹⁴NH₃ and ¹⁵NH₃ have been identified and assigned in the long-path Fourier transform spectra of ammonia. The data have been processed to obtain effective molecular parameters for the a2ν₂ states of ¹⁴NH₃ and ¹⁵NH₃.     

CH_3CN的ν_2～ν_3+ν_4费米共振研究

利用拉曼光谱技术测量了CH_3CN和CD_3CN在常温常压下的拉曼光谱,根据微扰理论建立了新的费米共振理论模型,结合同位素替换方法计算了CH_3CN的ν-2~ν_3+ν_4费米共振耦合系数,并且与利用传统Bertran公式计算结果进行了对比。新的费米共振理论模型利用振动能级的跃迁偶极矩实现了费米共振参数的计算,不仅能够计算未发生费米共振时两费米共振双线的初始光谱强度,而且还能够计算两费米共振双线的初始频率。最后,对利用Bertran公式计算获得的结果产生较大误差的原因进行了分析。     

Analysis of the Vibrational-Rotational Structure of 2ν1, ν1 + ν3, and 2ν3 Bands of the D2Se Molecule

The absorption spectrum of the D₂Se molecule in the region of 2₁, ₁ + ₃, and 2₃ absorption bands is registered with a high-resolution Fourier spectrometer and is studied theoretically for a Hamiltonian model with allowance for resonant interactions among (200), (101), and (002) vibrational states.     

A high-resolution study of the ν3 and 2ν80 bands of propyne

The ν₃ and 2ν₈⁰ parallel bands of propyne (methyl acetylene) at 2137.88 and 2066.33 cm⁻¹ have been studied at 0.006 cm⁻¹ resolution. Their Fermi resonance and interaction with the ν₈ + 2ν₉, ν₇ + ν₉, and ν₈ + ν₉ + ν₁₀ levels have been investigated. Molecular constants were determined from the assignment of 1150 lines. However, the rms error of 0.0028 cm⁻¹ showed the presence of additional perturbations which cannot be uniquely identified.     

Microwave spectrum of SiH3CCH in the 4ν10 state

The microwave spectrum of silyl acetylene in the 4ν₁₀ state has been investigated from 29 to 79 GHz. After an assignment by graphical methods deduced from approximate analytical formulas, molecular constants have been determined through an analysis by direct diagonalization. Some slight anomalies appear. A comparison is made between the constants of the different nν₁₀ states.     

Measurements of air and noble-gas broadening and shift coefficients of the methane R3 triplet of the 2ν3 band

By using a tunable diode laser spectrometer with one absorption White cell for low pressure and one photoacoustic cell for high pressure, line shape parameters of the R3 triplet of the 2ν₃ band of methane at 1.65 μm were measured. The absorption line was recorded by using the wavelength modulation spectroscopy technique with first harmonic detection. The broadening and shift coefficients were obtained by fitting the first harmonic absorption signal while varying the pressure of different perturbing gases: air and noble gases (helium, neon, argon, krypton and xenon). We present here the results for the R3 triplet. The observed shift and broadening coefficients behaviors are discussed. Received: 17 November 2000 / Revised version: 19 February 2001 / Published online: 27 April 2001     

High-resolution measurements of the ν2 and 2ν2-ν2 bands of SO2

Infrared measurements have been made on SO₂ between 450 and 602 cm⁻¹ with a resolution of 0.005 cm⁻¹. The B-type bands due to the bending mode transitions 010-000 and 020-010 have been assigned and analyzed for the ³²S¹⁶O₂ molecule. A total of 3007 transitions were measured and fit for ³²S¹⁶O₂ with a standard deviation of 0.0004 cm⁻¹. Ro-vibrational constants are given that fit the current measurements and the pure rotational transitions reported in the literature.     

CH_3CN分子ν_1,ν_4,ν_5,ν_7和ν_2+ν_4带的高分辨付里叶变换红外光谱研究

利用分辨率为0.06cm~(-1)的付里叶变换光谱技术研究了CH_3CN分子的v_1,v_4,v_5,v_7和v_2+v_4五个带。观察到了六百多条谱线,并利用最小二乘方方法对这些线进行了拟合,得到了一些新的分子常数。原有的常数也得到了很大的改进。     

Study of the ν3 and 2ν3 ← ν3 bands of 12CH3F by infrared laser sideband and submillimeter-wave spectroscopy

An infrared laser sideband spectrometer operating in the CO₂ laser region with 8- to 18-GHz sidebands has been used to record 266 transitions in the ν₃ band and 84 transitions in the 2ν₃ ← ν₃ band of ¹²CH₃F. The accuracy of the measured frequencies is estimated to be 1–3 MHz. A millimeter/submillimeter-wave spectrometer has been used to record the spectra of 48 pure rotational transitions in the ground vibrational state and 55 transitions in the v₃ = 1 vibrational state with an accuracy of 20–90 kHz. The new measurements have been combined with previous radio frequency and infrared laser results to derive sets of constants for the ground, v₃ = 1, and v₃ = 2 states for this molecule. Tables of the vibrational dependence of the parameters and of the near coincidences of the ν₃ and 2ν₃ ← ν₃ band transitions with CO₂ laser frequencies are given.     

谈谈ν=νλ中的ν

本文指出，在波长、频率与波速的关系式ν＝νλ 中，ν是波的频率，不应看作波源的振动频率．两者只 有数量上的关系而不是同一概念．本文兼谈多普勒效 应的教学问题，以加深对ν的理解．     

The ν3 fundamental band of HDCO

The ν₃ fundamental band (CO stretch) of HDCO at 1724 cm^?1 has been studied using both conventional infrared absorption and CO laser Stark spectroscopy. In addition to the excited-state (v₃ = 1) rotational constants, improved constants for the ground state of HDCO have been obtained by combining previous microwave data with some infrared combination differences. The following constants were determined:

     

17.

Rotational analysis of 6ν₃ and 6ν₃+ν₂−ν₂ bands of N₂O from ICLAS spectra between 12,760 and 12,900 cm     

R. Milloud  S.A. Tashkun 《Journal of Quantitative Spectroscopy & Radiative Transfer》2011,112(3):553-557

The absorption spectrum of nitrous oxide (N₂O) has been recorded by Intracavity Laser Absorption Spectroscopy between 12,760 and 12,900 cm⁻¹. The rotational analysis led to an improved determination of rovibrational parameters of the 6ν₃ and 6ν₃+ν₂-ν₂ bands of ¹⁴N₂¹⁶O. The high J rotational levels of the (0 0 ⁰6) and (0 1 ¹6) upper states were found perturbed by an anharmonic interaction. Line intensity values of the 6ν₃ band are provided and the main effective dipole moment parameter has been determined.     

18.

First high-resolution analysis of the 5ν3 band of nitrogen dioxide near 1.3 μm     

D. Mondelain  A. Perrin  S. Kassi  A. Campargue 《Journal of Quantitative Spectroscopy & Radiative Transfer》2012,113(11):1058-1065

The first high-resolution absorption spectrum of the 5ν₃ band of the ¹⁴N¹⁶O₂ molecule at 7766.071 cm^?1 was recorded by high sensitivity CW-Cavity Ring Down Spectroscopy between 7674 and 7795 cm^?1. The noise equivalent absorption of the recordings was α_min≈1×10^?10 cm^?1. The assignments involve energy levels of the (0,0,5) vibrational state with rotational quantum numbers up to K_a=9 and N=47. The set of the spin–rotation energy levels were reproduced within their experimental uncertainty using a theoretical model, which takes explicitly into account the Coriolis interactions between the spin rotational levels of the (0,0,5) vibrational state and those of the (0,2,4) dark state together with the electron spin–rotation resonances within the (0,0,5) and (0,2,4) states. Precise values were determined for the (0,0,5) vibrational energy rotational, spin-rotational constants and for the (0,2,4)?(0,0,5) coupling constants. In addition the (0,2,4) rotational and spin-rotational constants were estimated. Using these parameters and the value of the transition dipole moment operator determined from a fit of a selection of experimental line intensities, the synthetic spectrum of the 5ν₃ band was generated and is provided as Supplementary material.     

19.

Tunable diode laser study of the ν₃ band of oxirane     

Douglas K. Russell  Ralf Wesendrup 《Journal of Molecular Spectroscopy》2003,217(1):59-71

We have measured and fitted over 600 well-resolved lines in the ν₃ ring breathing band of oxirane. The spectrum is accurately reproduced by previously determined rotational and centrifugal distortion constants for the ground state, together with newly determined rotational, quartic and some sextic distortion constants for the upper state. The magnitudes of the distortion constants reveal some evidence of Coriolis interactions with nearby states. The band centre was determined as .     

20.

Line intensities of the: ν₃, 4ν₂, ν₁+ν₃, 3ν₁ and 2ν₁+2ν₂ bands of OCS molecule     

L. Régalia-Jarlot  A. HamdouniX. Thomas  P. Von der HeydenA. Barbe 《Journal of Quantitative Spectroscopy & Radiative Transfer》2002,74(4):455-470

     

Constant	Ground state	$\text{v}{}_3\text{= 1}$ state	Units
$\text{ν}{}_0$		1724.267	cm?1
$\text{A}$	198 119.75	198 210.4	MHz
$\text{B}$	34 910.646	34 676.6	MHz
$\text{C}$	29 561.488	29 331.3	MHz
$\text{μ}{}_{\mathrm{a}}$	2.3302	2.3486	D
$\text{μ}{}_{\mathrm{b}}$	0.195	0.190	D

Rotational analysis of 6ν3 and 6ν3+ν2−ν2 bands of N2O from ICLAS spectra between 12,760 and 12,900 cm

The absorption spectrum of nitrous oxide (N₂O) has been recorded by Intracavity Laser Absorption Spectroscopy between 12,760 and 12,900 cm⁻¹. The rotational analysis led to an improved determination of rovibrational parameters of the 6ν₃ and 6ν₃+ν₂-ν₂ bands of ¹⁴N₂¹⁶O. The high J rotational levels of the (0 0 ⁰6) and (0 1 ¹6) upper states were found perturbed by an anharmonic interaction. Line intensity values of the 6ν₃ band are provided and the main effective dipole moment parameter has been determined.     

First high-resolution analysis of the 5ν3 band of nitrogen dioxide near 1.3 μm

The first high-resolution absorption spectrum of the 5ν₃ band of the ¹⁴N¹⁶O₂ molecule at 7766.071 cm^?1 was recorded by high sensitivity CW-Cavity Ring Down Spectroscopy between 7674 and 7795 cm^?1. The noise equivalent absorption of the recordings was α_min≈1×10^?10 cm^?1. The assignments involve energy levels of the (0,0,5) vibrational state with rotational quantum numbers up to K_a=9 and N=47. The set of the spin–rotation energy levels were reproduced within their experimental uncertainty using a theoretical model, which takes explicitly into account the Coriolis interactions between the spin rotational levels of the (0,0,5) vibrational state and those of the (0,2,4) dark state together with the electron spin–rotation resonances within the (0,0,5) and (0,2,4) states. Precise values were determined for the (0,0,5) vibrational energy rotational, spin-rotational constants and for the (0,2,4)?(0,0,5) coupling constants. In addition the (0,2,4) rotational and spin-rotational constants were estimated. Using these parameters and the value of the transition dipole moment operator determined from a fit of a selection of experimental line intensities, the synthetic spectrum of the 5ν₃ band was generated and is provided as Supplementary material.     

Tunable diode laser study of the ν3 band of oxirane

We have measured and fitted over 600 well-resolved lines in the ν₃ ring breathing band of oxirane. The spectrum is accurately reproduced by previously determined rotational and centrifugal distortion constants for the ground state, together with newly determined rotational, quartic and some sextic distortion constants for the upper state. The magnitudes of the distortion constants reveal some evidence of Coriolis interactions with nearby states. The band centre was determined as .