HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: IX. SPECTRA OF H2, HD, AND D2

1957 ◽  
Vol 35 (6) ◽  
pp. 730-741 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Power Series ◽  
Infrared Spectra ◽  
Ground State ◽  
Power Series Expansion ◽  
Experimental Accuracy ◽  
Vibrational Bands ◽  
Complete Set ◽  
Electronic Ground

The pure rotational lines and the Q branch lines of the 1–0 vibrational bands of H2, HD, and D2 have been photographed with a 21 ft. grating spectrograph. From these spectra, a complete set of constants for the ν = 0 and 1 levels of all three molecules have been determined. When these constants are combined with Herzberg's results of the forbidden infrared spectra of H2 and HD they lead to improved values of the electronic ground state constants of H2 and HD. The leading terms in the Dunham power series expansion of the potential are calculated for H2 and HD and are found to be mutually consistent. The isotopic relations are obeyed within experimental accuracy, and the small constants De, Be, and He, are in agreement with values given by theoretical formulae.

High Resolution Infrared Spectra of the ν2 and 2ν1 Bands of 14N16O2

1975 ◽  
Vol 53 (19) ◽  
pp. 1902-1926 ◽  
Author(s):  
Aldée Cabana ◽  
Michel Laurin ◽  
Walter J. Lafferty ◽  
Robert L. Sams
Keyword(s):  
High Resolution ◽  
Infrared Spectra ◽  
Ground State ◽  
Equilibrium Structure ◽  
Coriolis Interaction ◽  
Rotational Constants ◽  
Average Structures

The infrared spectra of two B type bands, ν2 and 2ν1, of 14N16O2 have been recorded under high resolution. Ground state combination differences from these bands have been combined with combination differences obtained in previous studies and eight pure rotational microwave transitions to yield improved ground state rotational constants. Upper state constants and band centers for the ν2 and 2ν1 bands are also reported. The 2ν1 band contains internal intensity anomalies believed to arise from a weak Coriolis interaction with the much stronger ν1 + ν3 band. Equilibrium rotational constants have been calculated. The equilibrium structure of the molecule is: rc = 1.1945 ± 0.0005 Å and Θc = 133.85 ± 0.10°. For the sake of comparison, effective, substitution, and average structures are also reported.

Ozone spectroscopy in the electronic ground state: High-resolution spectra analyses and update of line parameters since 2003

2013 ◽  
Vol 130 ◽  
pp. 172-190 ◽  
Author(s):  
A. Barbe ◽  
S. Mikhailenko ◽  
E. Starikova ◽  
M.-R. De Backer ◽  
Vl.G. Tyuterev ◽  
...  
Keyword(s):  
High Resolution ◽  
Ground State ◽  
Electronic Ground State ◽  
Electronic Ground

Vibration–rotation spectra of nitrous acid, HONO

1985 ◽  
Vol 63 (7) ◽  
pp. 962-965 ◽  
Author(s):  
C. M. Deeley ◽  
I. M. Mills ◽  
L. O. Halonen ◽  
J. Kauppinen
Keyword(s):  
Fourier Transform ◽  
Excited State ◽  
Standard Deviation ◽  
High Resolution ◽  
Infrared Spectra ◽  
Ground State ◽  
Nitrous Acid ◽  
Vibration Rotation ◽  
Line Positions ◽  
Better Than

High-resolution Fourier-transform infrared spectra have been recorded and analyzed for the ν4 ν5, and ν6 fundamental bands of trans-HONO, and for the ν4 fundamental of cis-HONO. The spectral resolution was better than 0.01 cm−1, and the rotational structure has been analyzed to give improved ground-state and excited-state rotational constants, with a standard deviation of the fit to the observed line positions of around 0.0006 cm−1. Two Coriolis interactions have been analyzed between the ν5 and ν6 bands of trans-HONO.

Infrared spectra of liquid hydrogen and deuterium

1994 ◽  
Vol 72 (1-2) ◽  
pp. 51-56 ◽  
Author(s):  
A. R. W. McKellar ◽  
M. J. Clouter
Keyword(s):  
High Resolution ◽  
Detailed Analysis ◽  
Infrared Spectra ◽  
Liquid Hydrogen ◽  
Theoretical Interest ◽  
Induced Absorption ◽  
Vibrational Bands

Precise high-resolution spectra of liquid H2 and D2 in the regions of their fundamental vibrational bands (4000–5000 and 2900–3600 cm−1, respectively) are reported for various temperatures in the range 18–30 K. In hydrogen, concentrations for the.J = 0 para-H2 species of 25% (normal H2), 95%, and 99% were studied. In deuterium, normal D2, with 67% in the, J = 0 ortho state, was studied. These are the first published spectra of liquid D2. A detailed analysis of these results is not possible within present theories of collision-induced absorption, but it is hoped that their publication will stimulate theoretical interest.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: XII. ROTATIONAL SPECTRA OF C2H4 AND C2D4 AND THE STRUCTURE OF THE ETHYLENE MOLECULE

1959 ◽  
Vol 37 (6) ◽  
pp. 703-721 ◽  
Author(s):  
J. M. Dowling ◽  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Ground State ◽  
Structural Parameters ◽  
Electron Diffraction Data ◽  
Rotational Constants ◽  
Ethylene Molecule ◽  
Rotational Spectra ◽  
Asymmetric Top

The pure rotational Raman spectra of C2H4 and C2D4 were photographed in the second order of a 21-ft grating. The resolution achieved was such that several lines due to single transitions were observed (and identified) in the spectra of both molecules. An analysis of these lines based on the non-rigid asymmetric top yielded the following rotational constants for the ground states:[Formula: see text]The structural parameters obtained from these constants are r0(C=C) = 1.339 ± 0.002 Å, r0(C—H) = 1.086 ± 0.003 Å, and [Formula: see text]. These values are in agreement with the recent preliminary results of the electron diffraction data. There is also agreement between the above values and those obtained from a recent study of the rotation–vibration spectra of C2H4 and C2D4, although the agreement between the ground state rotational constants is not as satisfactory.

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