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.

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.

Analyse vibrationnelle et rotationnelle de la transition A2Σ+–X2Πi de la molécule 63Cu80Se

1976 ◽  
Vol 54 (16) ◽  
pp. 1664-1668 ◽  
Author(s):  
Y. Lefebvre ◽  
J. L. Bocquet
Keyword(s):  
Band System ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Visible Band ◽  
Π State

High dispersion vibrational and rotational analysis of a 63Cu80Se visible band system has been performed.The presence of a splitting proportional to [Formula: see text] in each observed subsystem indicates that these bands arise from a transition from a 2Σ state (with γ-type doubling) to a 2Π state. This hypothesis allows us to derive specific molecular constants of these two states.

STRUCTURE OF THE BAND SPECTRUM OF CuCl MOLECULE: III. ROTATIONAL STRUCTURE OF THE B AND C SYSTEMS OF Cu65Cl35

1962 ◽  
Vol 40 (4) ◽  
pp. 423-430 ◽  
Author(s):  
P. Ramakoteswara Rao ◽  
R. K. Asundi ◽  
J. K. Brody
Keyword(s):  
High Resolution ◽  
Rotational Structure ◽  
Band Spectrum ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Initial States ◽  
Π State

The B and C band systems of Cu65Cl35 lying in the region 4600–5200 Å have been photographed in emission under high resolution. Rotational analysis of the (1,0), (0,0), and (0,1) bands of each system has been made. The analysis shows that the B and C systems involve transitions 1Π(B1Π)–X1Σ and 1Σ (C1Σ)–X1Σ respectively. Due to the influence of the closeby C1Σ state, the B1Π state shows appreciable Λ-type doubling. It is found that the B1Π and C1Σ states provide an instance closely resembling the case of Van Vleck's "pure precession". The principal molecular constants obtained for the initial states of the B and C systems of Cu65Cl35 are as follows (cm−1 units):[Formula: see text]

Rotational analysis of four bands of the γ′(B3Π–X3Δ) system of TiO

1979 ◽  
Vol 57 (1) ◽  
pp. 54-68 ◽  
Author(s):  
William H. Hocking ◽  
M. C. L. Gerry ◽  
A. J. Merer
Keyword(s):  
Ground State ◽  
Spin Orbit ◽  
Rotational Analysis ◽  
Centrifugal Distortion ◽  
Molecular Constants ◽  
Full Matrix ◽  
Ground State Spin ◽  
State Spin ◽  
Distortion Parameters ◽  
Π State

The (0,0), (1,0), (0,1), and (1,1) bands of the γ′(B3Π–X3Δ) system of TiO have been rotationally analysed up to J = 55. Accurate molecular constants have been determined for the ν = 0and ν = 1 levels of the B3Π and X3Δ states. The three substates of the B3Π state all show significant Λ-type doubling, which has been analysed using a full matrix treatment. Our new results give corrected values for the ground state spin–orbit splittings; they also illustrate very clearly the problem of the correlation of the various centrifugal distortion parameters appearing in the Hamiltonian for a triplet electronic state.

STRUCTURE OF THE BAND SPECTRUM OF CuCl MOLECULE: IV. ROTATIONAL STRUCTURE OF THE D AND E SYSTEMS OF Cu65Cl35

1962 ◽  
Vol 40 (10) ◽  
pp. 1443-1456 ◽  
Author(s):  
P. Ramakoteswara Rao ◽  
J. K. Brody ◽  
R. K. Asundi
Keyword(s):  
High Resolution ◽  
Rotational Structure ◽  
Band Spectrum ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Initial States ◽  
Π State

The D and E band systems of Cu65Cl35, lying in the region 3900–4700 Å, have been photographed in emission under high resolution and rotational analysis of the (3,1), (2,0), (1,0), (0,0), and (0,1) bands of the D system and the (4,1), (3,0), (2,0), (1,0), (0,0), and (0,1) bands of the E system has been made. It has been assumed in the analysis that the D and E systems involve transitions 1Π (D1Π)−X1Σ and 1Σ (E1Σ)−X1Σ respectively. Fairly large Λ-doubling is observed in the D1Π state. Certain features in the E(0,0) band, which are not well understood, have been pointed out. The principal molecular constants obtained for the initial states of the D and E systems of Cu65Cl35 are as follows (cm−1):[Formula: see text]

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

1972 ◽  
Vol 50 (2) ◽  
pp. 171-184 ◽  
Author(s):  
R. Colin ◽  
M. Carleer ◽  
F. Prevot
Keyword(s):  
High Resolution ◽  
Microwave Discharge ◽  
Band System ◽  
Opposite Sign ◽  
Electronic Configuration ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Π State

A rotational analysis has been performed on the 0–0, 1–1, 1–0, and 2–1 bands of the A2Π–X2Σ+ band system of the BeCl molecule photographed at high resolution in emission from a microwave discharge. The following principal molecular constants have been obtained.[Formula: see text]Inspection of the low J value lines shows that the A2Π state is a regular state derived from the electronic configuration σ2σ2π4π although the Λ-doubling constants p and q are of opposite sign.

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]

A high resolution study of A1Π–X1Σ transition of the PN molecule

1981 ◽  
Vol 59 (11) ◽  
pp. 1640-1652 ◽  
Author(s):  
S. N. Ghosh ◽  
R. D. Verma ◽  
J. VanderLinde
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Spectral Region ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Medium Resolution ◽  
Π State ◽  
Resolution Study

The emission spectrum of PN has been rephotographed at high resolution in the spectral region 2200 to 3100 Å. The bands analyzed involve ν′ = 0–10 to ν″ = 0–11 transitions of the A1Π–X1Σ+ system of which only a few of the strongest bands have previously been reported at low and medium resolution. From a rotational analysis of the spectrum, new perturbations in the ν′ = 0, 2, 3, and 7 levels of they'll have been observed. A deperturbation study of these levels as well as a previously reported perturbation in the ν′ = 1 identify the perturbing states as 3Δ perturbing A1Π, ν = 0 and 3Σ− perturbing A1Π, ν = 2 and 3; both states arising from the 1π42π37σ23π configuration. Molecular constants for the perturbing states are obtained in addition to improved molecular constants for the A1Π state.

New Results on the B2Σ+, b4Σ−, and X2Π States of PO

1975 ◽  
Vol 53 (4) ◽  
pp. 411-419 ◽  
Author(s):  
R. D. Verma ◽  
S. R. Singhal
Keyword(s):  
Extensive Study ◽  
Spin Coupling ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Molecular Constants ◽  
Π State

An extensive study of the β system of the PO molecule has been carried out. The rotational analysis of 23 bands has yielded the constants of the ν = 0–9 levels of the B2Σ+ state and of the ν = 0–11 levels of the X2Π state with a precision higher than previous measurements. The spin coupling constant, Aν, evaluated for the 12 levels of X2Π is found to follow the equation Aν = 224.03 + 0.18ν–0.013ν2. The perturbations observed in the B2Σ (ν = 6 and 7) levels have been interpreted as being caused by a 4Σ− state and the B′2Π state. A deperturbation calculation has been carried out to evaluate the molecular constants of the PO molecule in the 4Σ− state. Several new bands were also observed; some of these belong to the β and B′–X systems and others are left unassigned.

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