Multi-isotopologue analyses of new vibration–rotation and pure rotation spectra of ZnH and CdH

2006 ◽  
Vol 237 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Alireza Shayesteh ◽  
Robert J. Le Roy ◽  
Thomas D. Varberg ◽  
Peter F. Bernath
Keyword(s):  
Pure Rotation ◽  
Vibration Rotation

INFLUENCE OF VIBRATION–ROTATION INTERACTION ON THE INTENSITIES OF PURE ROTATION LINES OF DIATOMIC MOLECULES

1956 ◽  
Vol 34 (11) ◽  
pp. 1119-1125 ◽  
Author(s):  
Robert Herman ◽  
Robert J. Rubin
Keyword(s):  
Line Intensity ◽  
Anharmonic Oscillator ◽  
Diatomic Molecules ◽  
Potential Energy Function ◽  
Complete Agreement ◽  
Contact Transformation ◽  
First Order ◽  
Pure Rotation ◽  
Rotation Line ◽  
Vibration Rotation

The magnitude of the effect of the vibration–rotation interaction on the intensities of pure rotation lines of diatomic molecules has been calculated for two different molecular models, the anharmonic oscillator and the rotating Morse or Pekeris oscillator. The intensity correction for the anharmonic oscillator has been obtained by adapting the contact transformation formalism for calculating second-order corrections to the energy to the calculation of first-order corrections to the matrix elements of the electric moment as suggested by H. H. Nielsen. The correction to the line intensity for vibrationless transitions of the anharmonic oscillator is found to be[Formula: see text]The results obtained here are also in complete agreement, to first order, with the results obtained earlier by Herman and Wallis for the 1–0 and 2–0 vibration–rotation line intensities. In the case of the Pekeris or rotating Morse oscillator the correction to the pure rotation line intensity is of the same form as above, namely,[Formula: see text]but exhibits minor differences which can be explained in terms of the difference in the vibrational potential energy function in the two cases.

High-resolution Raman spectroscopy of gases and the determination of molecular bond lengths

2000 ◽  
Vol 78 (5-6) ◽  
pp. 327-390 ◽  
Author(s):  
W J Jones
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Bond Length ◽  
Subsequent Development ◽  
Bond Lengths ◽  
Pure Rotation ◽  
Wide Range ◽  
Laser Sources ◽  
Vibration Rotation

This review highlights the developments that have taken place in the field of high-resolution Raman spectroscopy of gases from the pioneering studies of Stoicheff and Welsh in the early fifties to the present day. This period has seen major changes in the methods that have been employed for investigating pure rotation and vibration-rotation spectra from these initial studies with Hg excitation through to the deployment of laser sources for incoherent Raman scattering at enhanced sensitivity, and the subsequent development of the techniques of nonlinear Raman spectroscopy at resolutions of ~10-3 cm-1. A central theme in this review is the measurement of accurate rotational constants for nonpolar molecules that have then been employed for the determination of molecular geometries and bond lengths. The studies by Stoicheff of the pure rotational spectra of a wide range of linear and symmetric-top molecules provided an extensive data base that served to supplement bond-length determinations from other methods and enabled him to correlate CC and CH bond length variations in noncyclic compounds with changes in their environment. The discovery of laser sources in the sixties provided exciting new opportunities for the examination of pure rotation and vibration-rotation spectra at enhanced resolution and sensitivity and broadened dramatically the scope of the field. Apart from the improvements in the incoherent scattering methods afforded by these new sources, the discovery of a range of new nonlinear Raman phenomena, a field in which Stoicheff made equally important contributions, led to the creation of a range of new coherent nonlinear Raman methods that have been widely employed for the study of all rotor classes. Representative examples of the many investigations performed with the various spectroscopic methods over this period are given, together with the results of the structure determinations achieved from the analyses of the rotational spectra.PACS Nos.: 33.20Fb, 36.20.Hb

Spectre de vibration-rotation de l’acide chlorhydrique gazeux

1965 ◽  
Vol 62 ◽  
pp. 600-603 ◽  
Author(s):  
Armand Lévy ◽  
Inga Rossi ◽  
Colette Joffrin ◽  
Nguyen Van Thanh
Keyword(s):  
Vibration Rotation
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