Rotational analysis of selected bands from the electronic spectrum of the LuF molecule

1976 ◽  
Vol 54 (3) ◽  
pp. 279-294 ◽  
Author(s):  
C. Effantin ◽  
G. Wannous ◽  
J. d'Incan ◽  
C. Athenour
Keyword(s):  
Electronic Spectrum ◽  
Excited States ◽  
Direct Approach ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Fundamental State

Rotational analysis of 20 selected bands from the electronic spectrum of the LuF molecule has been carried out. No perturbation was detected; the molecular constants deduced from a 'direct approach' including all the bands are given for the fundamental state X1Σ (ωe = 611.79, Be = 0.26764) and the excited states A1Σ (ωe = 587.95, Be = 0.26356), B1Π (ωe = 581.3, Be = 0.2632), E1Π (ωe = 543.42, Be = 0.25647), and F1Σ (ωe = 560.8, Be = 0.25815).

Le spectre electronique de la molécule LuD

1974 ◽  
Vol 52 (6) ◽  
pp. 523-535 ◽  
Author(s):  
Christiane Effantin ◽  
Jean D'Incan
Keyword(s):  
Electronic Spectrum ◽  
Hollow Cathode ◽  
Isotope Shift ◽  
Visible Region ◽  
Mutual Interaction ◽  
Electronic Transitions ◽  
Molecular Constants ◽  
Fundamental State ◽  
Symmetry Properties ◽  
Vibrational Levels

The electronic spectrum of LuD has been excited in a Lu2O3–Th–Cu hollow cathode filled with argon and traces of deuterium. All the recorded bands, lying in the visible region, belong to six electronic transitions towards the X1Σ+ fundamental state of the molecule. Molecular constants and symmetry properties of these states have been deduced from the vibrational and rotational analyses. The electronic isotope shift has been obtained from data of the H → X system. Finally, the anomalous intensities observed in the Δν = 2 sequences of the E → X and G → X systems are explained in terms of a mutual interaction between pairs of vibrational levels belonging to the E and G states.

Electronic Spectrum of the N80Se Molecule in the Region 2840–3200 Å

1971 ◽  
Vol 49 (15) ◽  
pp. 2033-2051 ◽  
Author(s):  
L. Harding ◽  
W. E. Jones ◽  
K. K. Yee ◽  
A. Jenouvrier ◽  
D. Daumont ◽  
...  
Keyword(s):  
Electronic Spectrum ◽  
Ground State ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Molecular Constants ◽  
First Time

The vibrational and rotational analysis of 12 red degraded bands of N80Se, in the region 2800 to 3200 Å, is reported. These bands are attributed to two progressions, ν′ = 1 and ν′ = 2, of the subsystem C2Δ5/2–X2Π3/2 and to two progressions, ν′ = 0, of the system B2Σ–X2Π(a).Tables of molecular constants of the observed states are given. For the first time it has been possible to calculate the spin–orbit coupling constant, Aeff, of the ground state, X2Π(a).

Rotational Analysis of the lΠ–XlΣ+ System of C80Se

1974 ◽  
Vol 52 (9) ◽  
pp. 813-820 ◽  
Author(s):  
René Stringat ◽  
Jean-Paul Bacci ◽  
Marie-Hélène Pischedda
Keyword(s):  
Emission Spectrum ◽  
Ground State ◽  
High Frequency ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
High Frequency Discharge ◽  
Perturbed State ◽  
Simple Evaluation ◽  
Π State

The strongly perturbed 1Π–X1Σ+ system of C80Se has been observed in the emission spectrum of a high frequency discharge through selenium and carbon traces in a neon atmosphere. The analysis of five bands yields, for the molecular constants of the ground state, the values Be″ = 0.5750 cm−1, [Formula: see text], αe″ = 0.00379 cm−1, re″ = 1.676 Å, ΔG″(1/2) = 1025.64 cm−1, and ΔG″(3/2) = 1015.92 cm−1. The numerous perturbations in the 1Π state prohibit the simple evaluation of the constants of the perturbed state and of the perturbing ones.

High-resolution laser-excitation spectrum of the A2Π ← X2Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands

1985 ◽  
Vol 63 (7) ◽  
pp. 997-1004 ◽  
Author(s):  
K. Brabaharan ◽  
J. A. Coxon ◽  
A. Brian Yamashita
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Excitation Spectrum ◽  
Laser Excitation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Individual Bands ◽  
Measured Line ◽  
Line Positions ◽  
Π State

The 0–0, 1–1, and 2–2 bands of the A2Π ← X2Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A2Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.

Excited states and electronic spectrum of ferrocene

1974 ◽  
Vol 29 (3) ◽  
pp. 466-468 ◽  
Author(s):  
Marie-Madeleine Rohmer ◽  
Alain Veillard ◽  
Melvyn H. Wood
Keyword(s):  
Electronic Spectrum ◽  
Excited States

New analysis of the (0,0) band of the 2Π → 2Σ transition of TiN

1982 ◽  
Vol 60 (2) ◽  
pp. 109-116 ◽  
Author(s):  
C. Athénour ◽  
J.-L. Féménias ◽  
T. M. Dunn
Keyword(s):  
Rotational Analysis ◽  
Molecular Constants ◽  
Computation Procedure ◽  
Π State

From new spectra and by the use of a better computation procedure it has been possible to improve the rotational analysis of the (0,0) band of the red system of TiN. In particular, the spin doubling of the lower 2Σ state has been resolved and two new perturbations have been identified in the 2Π state. The inclusion of high values of J yields more accurate molecular constants.

Absorption spectrum of SiH in the vacuum ultraviolet

1969 ◽  
Vol 47 (18) ◽  
pp. 1889-1897 ◽  
Author(s):  
G. Herzberg ◽  
A. Lagerqvist ◽  
B. J. McKenzie
Keyword(s):  
Absorption Spectrum ◽  
Electronic Transition ◽  
Vacuum Ultraviolet ◽  
Rotational Analysis ◽  
Molecular Constants

A new electronic transition of SiH has been observed in absorption near 1907 Å in flash discharges through mixtures of SiH4 and H2. The rotational analysis shows this transition to be of the type 2Σ+−2Π. The corresponding transition of SiD has also been observed and analyzed. The D2Δ−X2Π transition near 2058 Å which was observed and analyzed by Verma in SiD has been measured here for SiH, where the lines are much broader on account of predissociation. The predissociation phenomena in SiH and SiD and the electron configurations are briefly discussed, and the presently known molecular constants of these molecules are summarized.

Rotational Analysis of the A2Π–X2Σ+ Band System of the BeBr Molecule

1975 ◽  
Vol 53 (14) ◽  
pp. 1321-1326 ◽  
Author(s):  
M. Carleer ◽  
M. Herman ◽  
R. Colin
Keyword(s):  
High Resolution ◽  
Hollow Cathode ◽  
Band System ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Bromine Vapor

A rotational analysis has been performed on the 0–0 band of the A2Π–X2Σ+ transition of the BeBr molecule photographed at high resolution in emission from a beryllium hollow cathode in the presence of bromine vapor. The following principal molecular constants have been determined:[Formula: see text]

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