Determination of the centrifugal–distortion‐induced dipole moment of SnH4 by infrared–infrared double resonance Stark spectroscopy

1988 ◽  
Vol 88 (11) ◽  
pp. 6747-6750 ◽  
Author(s):  
Yasuhiro Ohshima ◽  
Yoshiyasu Matsumoto ◽  
Michio Takami ◽  
Kozo Kuchitsu
Keyword(s):  
Dipole Moment ◽  
Double Resonance ◽  
Centrifugal Distortion ◽  
Stark Spectroscopy ◽  
Induced Dipole

Avoided-crossing molecular-beam spectroscopy of symmetric tops. I. Phosphoryl fluoride (OPF3)

1981 ◽  
Vol 59 (1) ◽  
pp. 150-171 ◽  
Author(s):  
Irving Ozier ◽  
W. Leo Meert
Keyword(s):  
Dipole Moment ◽  
Molecular Beam ◽  
Wave Functions ◽  
Matrix Elements ◽  
Centrifugal Distortion ◽  
Electric Resonance ◽  
Avoided Crossing ◽  
Mixing Matrix ◽  
The Individual

A new avoided-crossing technique using a conventional molecular beam electric resonance spectrometer has been developed for studying symmetric rotors. By means of an external electric field, two levels with different values of K are made nearly degenerate and normally forbidden electric-dipole transitions between the interacting levels are observed. Mixing matrix elements ηST with ΔK = ± 3 arise from the centrifugal distortion dipole moment μD and mixing terms ηHYP, with ΔK = ± 1, ± 2 arise from the nuclear hyperfine Hamiltonian. Explicit expressions for ηHYP are given in an Appendix. Many of these terms break the symmetry of both the rotational and nuclear spin parts of the wave functions. The avoided-crossing method is discussed in detail, with emphasis on its application to the measurement of (A0–B0). It is shown how the technique can be used to determine the perpendicular moment μD, as well as μJ, and μK, the constants which characterize the dependence of the parallel dipole moment μ on J and K, respectively. Other applications include the experimental investigation of the selection rules for the individual terms in ηHYP and the determination of the sign of the rotational g-factors [Formula: see text] and [Formula: see text].∙The method has been applied to phosphoryl fluoride (OPF3). It has been determined that (A0–B0) = 217.4987(44) MHz, μD = 5.856(20) × 10−6 D, μJ = −3.38(10) × 10−6 D, and both [Formula: see text] and [Formula: see text] are negative.

CO2 laser Stark spectroscopy of the ν4 band of SiDF3: The C0 rotational constant and vibrationally induced dipole moment

1989 ◽  
Vol 138 (1) ◽  
pp. 230-245 ◽  
Author(s):  
Kensuke Harada ◽  
Ichirou Nagano ◽  
Susumu Kimura ◽  
Keiichi Tanaka ◽  
Takehiko Tanaka
Keyword(s):  
Dipole Moment ◽  
Co2 Laser ◽  
Rotational Constant ◽  
Stark Spectroscopy ◽  
Induced Dipole ◽  
Laser Stark

On nuclear spin statistics in rotational transition intensities in tetrahedral AB4 molecules

1979 ◽  
Vol 57 (8) ◽  
pp. 1081-1089 ◽  
Author(s):  
Arieh Rosenberg ◽  
Joel Susskind
Keyword(s):  
Dipole Moment ◽  
Nuclear Spin ◽  
Rotational Transition ◽  
Polarizability Tensor ◽  
Centrifugal Distortion ◽  
Induced Dipole ◽  
Integrated Intensity ◽  
Nuclear Spin Statistics ◽  
Tetrahedral Molecules ◽  
Integrated Intensities

A general expression is derived for the integrated intensity of rotational transitions in the vibronic ground state of tetrahedral molecules, taking into account the nuclear spin statistics. It is shown that the ratio of this expression to previously published spin-free integrated intensities depends only on the tensor character N of the operator driving the transition, the appropriate rotational quantum numbers J and J′, and the nuclear spin IB of the identical nuclei. Tables are given for N = 3, 4 and J ≤ 50 which enable the calculation of integrated intensities for octopole and hexadecapole collision induced dipole moment transitions, centrifugal distortion induced dipole moment transitions, and centrifugal distortion induced anisotropic polarizability tensor Raman transitions. It is shown that the relative error of the spin-free integrated intensity calculation is proportional to (2IB + 1)−2.

Determination of the Dipole Moment of O-18 Methanol by Microwave Stark Spectroscopy

1996 ◽  
Vol 176 (1) ◽  
pp. 38-44 ◽  
Author(s):  
K.V.L.N. Sastry ◽  
I. Mukhopadhyay ◽  
P.K. Gupta ◽  
J. VanderLinde
Keyword(s):  
Dipole Moment ◽  
Stark Spectroscopy ◽  
O 18

Moment analysis in collision-induced absorption: Determination of a single parameter empirical model for the induced dipole moment of He-Ar gas mixtures

2021 ◽  
pp. 1-16
Author(s):  
M.S.A. El-Kader ◽  
G. Maroulis
Keyword(s):  
Dipole Moment ◽  
Empirical Model ◽  
Adjustable Parameter ◽  
Classical Physics ◽  
Induced Absorption ◽  
Induced Dipole ◽  
Absorption Determination ◽  
Ar Gas ◽  
Good Agreement

We present a method for the construction of a one-adjustable-parameter empirical model for the induced dipole moment. The method is based on classical physics principles and relies on the first three spectral moments of the collision-induced absorption spectra at various temperatures and new interaction potentials. In this work it is applied to the spectra of He-Ar mixtures. Our values are in good agreement with the available ab initio data. The profiles calculated with these models at various temperatures are in excellent agreement with experiment.

Millimeter Wave Rotational Spectrum and Centrifugal Distortion of Thioketene, H2C==C=S

1980 ◽  
Vol 35 (5) ◽  
pp. 483-489 ◽  
Author(s):  
Manfred Winnewisser ◽  
Eckhard Schäfer
Keyword(s):  
Dipole Moment ◽  
Ground State ◽  
Wavelength Region ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Millimeter Wavelength ◽  
Vibrational Ground State ◽  
Distortion Analysis ◽  
Centrifugal Distortion Constants

Abstract a-type rotational transitions of molecules in the vibrational ground state of thioketene, H2C=C=S, have been measured in the millimeter wavelength region. The measurements yielded improved rotational constants:A = 286 655(82) MHz,B = 5 659.47596(72) MHz,C = 5 544.51269(72) MHz.A detailed centrifugal distortion analysis by means of Watson's S-reduced Hamiltonian led to the determination of four quartic, two sextic and two higher order distortion constants:DJ = 1.08569(4) kHz, HJK = 0.716(20) Hz, DJK = 168.269(77) kHz, HKJ = -408.7(73) Hz, D1 = -25.46(68) Hz, LKJ = 0.65(24) Hz, d2 = - 5.21(35) Hz, SKJ = -0.0533(24) Hz. Effective rotational and centrifugal distortion constants using planarity conditions were calculated. The electric dipole moment of thioketene was determined to be μ = 1.01(3) D.

Determination of the Dipole Moment of 13C Methanol by Microwave Stark Spectroscopy

1994 ◽  
Vol 168 (2) ◽  
pp. 374-383 ◽  
Author(s):  
K.V.L.N. Sastry ◽  
J. Vanderlinde ◽  
D. Donovan ◽  
I. Mukhopadhyay ◽  
P.K. Gupta
Keyword(s):  
Dipole Moment ◽  
Stark Spectroscopy
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