Shock-tube measurements of the absorption oscillator strength for the OH 2Σ→2Π electronic band system

Two new band systems have been observed in absorption following flash photolysis of AsH 3 and AsD 3 , and are assigned to 2 A 1 - 2 B 1 electronic transitions of AsH 2 and AsD 2 . The origins of both systems are at 19905 cm -1 . The bands have the complex rotational structure associated with an asymmetric rotor. Rotational analyses have been carried out for three bands of the AsH 2 spectrum, leading to the following molecular parameters: ground state, r" 0 = 1.518 Å valence angle = 90° 44'; excited state, r' 0 = 1.48 Å, valence angle = 123° 0'. The parameters associated with rotation about the a inertial axis increase rapidly with increase in v' 2 . The spectrum shows doublet splittings of up to 41 cm -1 , and the excited state furnishes the first example of a doublet state of an asymmetric top molecule which shows substantial departures from Hund’s case ( b ).

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First observation of an electronic band system of the AsCl+ cation: Vibrational analysis of a visible 2Π → X2Π system

Spectrochimica Acta Part A Molecular Spectroscopy ◽

10.1016/0584-8539(85)80195-1 ◽

1985 ◽

Vol 41 (12) ◽

pp. 1409-1412 ◽

Cited By ~ 4

Author(s):

J.A. Coxon ◽

S. Naxakis ◽

A.Brian Yamashita

Keyword(s):

Band System ◽

Vibrational Analysis ◽

Electronic Band

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Oscillator Strength of the NO γ-Band System

Journal of the Optical Society of America ◽

10.1364/josa.50.000740 ◽

1960 ◽

Vol 50 (7) ◽

pp. 740 ◽

Cited By ~ 3

Author(s):

Robert F. Hughes

Keyword(s):

Oscillator Strength ◽

Band System

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Laser-Induced-Fluorescence Spectrum of the CNN Molecule

Laser Chemistry ◽

10.1155/lc.9.359 ◽

1988 ◽

Vol 9 (4-6) ◽

pp. 359-368 ◽

Cited By ~ 10

Author(s):

M. C. Curtis ◽

A. P. Levick ◽

P. J. Sarre

Keyword(s):

Low Temperature ◽

Gas Phase ◽

Fluorescence Spectra ◽

Laser Excitation ◽

Band System ◽

Laser Induced Fluorescence ◽

Rotational Spectrum ◽

Spin Orbit ◽

Electronic Band ◽

Temperature Matrix

We have recorded a laser excitation spectrum of the A3Π–X3Σ− electronic band system of the CNN radical in the gas phase, at a resolution of ca. 0.8 cm−1. The rotational branch structure of the vibrational band near 419 nm has been simulated and molecular parameters are obtained. The results are compared with data from laser-induced-fluorescence spectra of CNN trapped in a low-temperature matrix. A revised value for the spin-orbit parameter in the A3Π state is obtained and comparison is made with the values for related molecules. The possible detection of CNN in astrophysical sources is considered and the general features of its rotational spectrum in the ground electronic state are described.

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