Pure rotational spectrum of SnH4 in the vibrational ground state observed by infrared‐radio frequency double resonance

1986 ◽  
Vol 85 (10) ◽  
pp. 5519-5523 ◽  
Author(s):  
Yasuhiro Ohshima ◽  
Yoshiyasu Matsumoto ◽  
Michio Takami ◽  
Kozo Kuchitsu
Keyword(s):  
Radio Frequency ◽  
Ground State ◽  
Double Resonance ◽  
Rotational Spectrum ◽  
Vibrational Ground State

Pure rotational spectrum of 13CD4 and isotope effects on the tensorial centrifugal-distortion constants of methane

1987 ◽  
Vol 65 (1) ◽  
pp. 32-37 ◽  
Author(s):  
W. A. Kreiner ◽  
P. Müller ◽  
L. Jörissen ◽  
M. Oldani ◽  
A. Bauder
Keyword(s):  
Fourier Transform ◽  
Radio Frequency ◽  
Ground State ◽  
Isotope Effects ◽  
Double Resonance ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Theoretical Predictions ◽  
Deuterium Isotope Effects ◽  
Centrifugal Distortion Constants

Infrared-laser – radio-frequency double-resonance experiments and pulsed-microwave Fourier-transform measurements have been performed with 13CD4. From 25 observed ΔJ = 0 transitions in the vibronic ground state, the tensorial centrifugal-distortion constants Dt = 32.6600(12) kHz, H4t = −2.0302(61) Hz, H6t = 1.1692(29) Hz, L4t = 1.201(77) × 10−4 Hz, L6t = −1.353(63) × 10−4 Hz, and L8t = −1.466(46) × 10−4 Hz have been determined. Experimental carbon-13 and deuterium isotope effects on the tensorial centrifugal-distortion constants of methane have been compared with theoretical predictions.

scholarly journals Methyl Internal Rotation Fine Structure in the Ground State Rotational Spectrum of Gauche Butane

1990 ◽  
Vol 45 (8) ◽  
pp. 989-994 ◽  
Author(s):  
Kirsten Vormann ◽  
Helmut Dreizler ◽  
Hans Hübner ◽  
Wolfgang Hüttner
Keyword(s):  
Fine Structure ◽  
Internal Rotation ◽  
Barrier Height ◽  
Ground State ◽  
High Accuracy ◽  
Rotational Spectrum ◽  
Frequency Range ◽  
Vibrational Ground State ◽  
Rotation Parameters

Abstract The methyl torsional fine structure in the rotational spectrum of gauche butane in the vibrational ground state was investigated in the frequency range between 10 and 141 GHz. Using the internal axis method (IAM) in the formulation of Woods, all internal rotation parameters were determined with high accuracy. The barrier height of the methyl internal rotation was determined to 11.34 (29) kJ/mol (2.710 (69) kcal/mol)

Determination of a High Potential Barrier Hindering Internal Rotation from the Ground State Spectrum. The Methylbarrier of Ethylbromide

1985 ◽  
Vol 40 (6) ◽  
pp. 575-587 ◽  
Author(s):  
J. Gripp ◽  
H. Dreizler ◽  
R. Schwarz
Keyword(s):  
Hyperfine Structure ◽  
Internal Rotation ◽  
Potential Barrier ◽  
Ground State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational Ground State ◽  
Distortion Analysis ◽  
High Potential Barrier

For ethylbromide a determination of the parameters of internal rotation is given derived from the rotational spectrum of the torsional and vibrational ground state. The Br-hyperfine structure is reanalysed with higher precision. As high J transitions were measured a centrifugal distortion analysis was necessary.

Rotational Spectrum of cis-HS3D

1992 ◽  
Vol 47 (10) ◽  
pp. 1091-1093 ◽  
Author(s):  
M. Liedtke ◽  
A. H. Saleck ◽  
J. Behrend ◽  
G. Winnewisser ◽  
R. Klünsch ◽  
...  
Keyword(s):  
Ground State ◽  
Rotational Spectrum ◽  
Frequency Range ◽  
Rotational Constants ◽  
Vibrational Ground State ◽  
Q 30

AbstractThe rotational spectrum of HS3D in the vibrational ground state has been measured in the frequency range between 75 and 293 GHz. Up to now, about 180 Q-, 30 P-, and 70 R-branch c-type transitions have been identified. The preliminary rotational constants of the species observed support the cis-conformation established earlier from the H2S3 rotational spectrum.

High-Resolution Vibrational Spectra of Furazan

1991 ◽  
Vol 46 (10) ◽  
pp. 841-850
Author(s):  
Otto L. Stiefvater
Keyword(s):  
Excited States ◽  
Ground State ◽  
Double Resonance ◽  
Microwave Spectroscopy ◽  
Statistical Uncertainty ◽  
Molecular Constants ◽  
Vibrationally Excited ◽  
Vibrational Ground State ◽  
Vibrational Bands ◽  
Ft Ir

AbstractThe study by Fourier transform (FT) infrared (IR) spectroscopy of the fundamental vibrational bands v12 and v5 of furazan yields the origins of these bands with a statistical uncertainty of 10-6 cm-1, which leads to an estimated absolute uncertainty of 10-4 cm-1. The values are v°12 = 952.6123 cm -1 and v°5 = 1.005.3536 cm -1. They confirm the values previously deduced from laser/microwave double resonance (LMDR) experiments. Previous results for the molecular constants of the vibrational ground state and of the two vibrationally excited states, as obtained by double resonance modulation (DRM) microwave spectroscopy alone, are confirmed and refined. Advantages brought about through the combination of the DRM microwave and the FT-IR technique are outlined.

The ν3 fundamental of silicon tetrafluoride. Spectroscopy with laser sidebands

1989 ◽  
Vol 67 (5) ◽  
pp. 532-542 ◽  
Author(s):  
L. Jörissen ◽  
H. Prinz ◽  
W. A. Kreiner ◽  
Ch. Wenger ◽  
G. Pierre ◽  
...  
Keyword(s):  
Excited State ◽  
Radio Frequency ◽  
Ground State ◽  
Double Resonance ◽  
Sixth Order ◽  
Silicon Tetrafluoride ◽  
Rotational Transitions

The ν3 fundamental of 28SiF4 has been investigated with laser sidebands and infrared radio-frequency double resonance. From 165 infrared and 206 pure rotational transitions, 10 ground state and 22 excited state constants have been determined. The calculation was performed with a Hamiltonian developed up to sixth order.

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