Rotational Analysis of the C2Π → X2Σ+ Electronic Transition of LaO

1971 ◽  
Vol 49 (20) ◽  
pp. 2552-2564 ◽  
Author(s):  
David W. Green
Keyword(s):  
Unpaired Electron ◽  
Nuclear Spin ◽  
Electronic Transition ◽  
Rotational Level ◽  
Spectroscopic Constants ◽  
Rotational Analysis ◽  
Pure Case ◽  
X State ◽  
Π State

A rotational analysis of the 0–0 band of the LaO C2Πr → X2Σ+ transition near 4400 Å has revised the previously reported analysis. It is demonstrated that the C2Π state is also the upper state of previously analyzed bands near 6500 Å. It is shown that the X state of LaO is 2Σ+ and that an interaction between the unpaired electron and the La nuclear spin causes a doubling (0.51 cm−1) of each rotational level. This splitting appears to show a slight rotational dependence and a negligible vibrational dependence. The coupling of the X2Σ+ state is nearly pure case bβS. The C2Πr state exhibits a large Λ doubling. The 0–0 subband origins are at 22 839.61 for the C2Π3/2 → X2Σ+ and 22 618.87 cm−1 for the C2Π1/2 → X2Σ+. Rotational spectroscopic constants are reported.

Le spectre électronique de PS. Première partie : le systeme B2Π–X2Π

1978 ◽  
Vol 56 (8) ◽  
pp. 1088-1097 ◽  
Author(s):  
A. Jenouvrier ◽  
B. Pascat
Keyword(s):  
Electronic Transition ◽  
Equilibrium Constants ◽  
Rotational Analysis ◽  
Π State ◽  
Premiere Partie

The electronic transition B2Π–X2Π of PS has been studied in the region 3450–5700 Å. One hundred fourteen sub-bands have been put in the vibrational classification. They arise from 13 levels (ν = 0 to 12) of the B2Π state and from 10 levels (ν = 0 to 9) of the X2Π state.The rotational analysis of 50 sub-bands allows the determination of the equilibrium constants of the two states and presents the perturbations in the levels ν > 9 of the B2Π state.

STRUCTURE OF THE BAND SPECTRUM OF CuCl MOLECULE: II. ROTATIONAL STRUCTURE OF THE F–X BAND SYSTEM OF Cu65Cl35

1962 ◽  
Vol 40 (4) ◽  
pp. 412-422 ◽  
Author(s):  
P. Ramakoteswara Rao ◽  
R. K. Asundi ◽  
J. K. Brody
Keyword(s):  
High Resolution ◽  
Electronic Transition ◽  
Band System ◽  
Rotational Structure ◽  
Band Spectrum ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
X Band ◽  
Π State

The F–X band system of Cu65Cl35 extending from 3700 to 4200 Å has been photographed in emission under high resolution. Rotational analysis of the (3,0), (2,0), (1,0), (0,0), (0,1), and (0,2) bands of the system has been made. The electronic transition involved is found to be 1Π–1Σ. The Λ-type doubling in the 1Π state is negligible. The principal molecular constants obtained are as follows (cm−1 units)[Formula: see text]

ROTATIONAL ANALYSIS OF THE β BANDS OF PHOSPHORUS MONOXIDE

1959 ◽  
Vol 37 (2) ◽  
pp. 136-143 ◽  
Author(s):  
Nand Lal Singh
Keyword(s):  
Ground State ◽  
Band System ◽  
Electronic States ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Fine Structures ◽  
Π State

The fine structures of three of the β bands of PO which occur near 3200 Å have been analyzed. The analysis shows that the upper state of this band system is a 2Σ and not a 2Π state as previously believed. The rotational constants of both electronic states have been determined and it is found that the ground state constants, previously determined from the γ bands, are incorrect.

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.

The Resonance Fluorescence and Absorption Spectrum of Nitrogen Dioxide

1973 ◽  
Vol 51 (20) ◽  
pp. 2184-2188 ◽  
Author(s):  
J. C. D. Brand ◽  
J. L. Hardwick ◽  
R. J. Pirkle ◽  
C. J. Seliskar
Keyword(s):  
Absorption Spectrum ◽  
Nitrogen Dioxide ◽  
Electronic Transition ◽  
Parallel Structure ◽  
Rotational Analysis ◽  
Resonance Fluorescence ◽  
Strong Resonance ◽  
Ion Laser

A krypton ion laser operating at 6470 Å excites strong resonance fluorescence in nitrogen dioxide gas. The fluorescence bands have "parallel" structure (ΔK = 0) and are assigned to the electronically allowed subsystem of a 2B2–2A1 electronic transition. A partial rotational analysis is given for the upper state of the fluorescence bands, and their relationship to the absorption spectrum in the region 6000–11 500 Å is discussed.

The A2Π–X2Σ+ system of MgCl

1987 ◽  
Vol 65 (12) ◽  
pp. 1594-1603 ◽  
Author(s):  
M. Singh ◽  
G. S. Ghodgaonkar ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Structure Analysis ◽  
Vibrational Level ◽  
High Frequency ◽  
Low Frequency ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
The Common ◽  
Π State

The A2Π–X2Σ+ system of MgCl has been photographed at high resolution and analyzed for the rotational structure. Analysis of the low-frequency sub-bands of the 0–0, 0–1, and 0–2 bands showed that there is a nonzero Λ doubling in the common vibrational level ν′ = 0, thereby indicating that the A2Π state is regular and not inverted as presumed by earlier workers. Spin-doubling has been seen in the ν = 1 and 2 levels of the X2Σ+ state. Rotational analysis of the high-frequency sub-band has also been done for the 0–0 band.

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.

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.

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