ChemInform Abstract: THE B3Π(0+) → X1Σ+ EMISSION SPECTRUM OF BROMINE FLUORIDE (79BRF AND 81BRF) IN THE RANGE 6250-8700 Å. ROTATIONAL ANALYSIS OF BANDS IN THE V′ = 0, 1, 2, 3, 4 PROGRESSIONS, AND MERGED MOLECULAR CONSTANTS FOR THE X1Σ+ AND B3Π(0+) STATES

1981 ◽  
Vol 12 (40) ◽  
Author(s):  
J. A. COXON ◽  
M. A. WICKRAMAARATCHI
Keyword(s):  
Emission Spectrum ◽  
Rotational Analysis ◽  
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.

Emission spectrum of the PO molecule. I. A new B′2Πi–X2Πr transition

1970 ◽  
Vol 48 (20) ◽  
pp. 2391-2398 ◽  
Author(s):  
R. D. Verma
Keyword(s):  
Emission Spectrum ◽  
Ground State ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
New System

A new system of the PO molecule in the region 4800–3800 Å has been obtained. Rotational analysis of its seven bands establishes the transition involved to be B′2Πi–X2Πr, where X2Πr is the known ground state of the molecule. The molecular constants of the lower and upper levels have been evaluated.

Isotope Shifts and Rotational Analysis of the As32S+A1Π–X1Σ Band System

1975 ◽  
Vol 53 (8) ◽  
pp. 831-840 ◽  
Author(s):  
Midori Shimauchi ◽  
Shiro Karasawa
Keyword(s):  
Emission Spectrum ◽  
Discharge Tube ◽  
Band System ◽  
Dissociation Limit ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Isotope Shifts ◽  
Dissociation Energies ◽  
Quantum Numbers

The emission spectrum of As32S+ and As34S+ has been excited in a quartz discharge tube by a 27 MHz oscillator. Vibrational isotope shifts have verified the vibrational quantum numbers of the upper and lower states. The 2–0, 1–0, 1–1, 0–1, 2–1, and 1–2 bands were chosen for the first rotational analysis of the As32S+ spectrum. The analysis has established that the transition is 1Π–1Σ. The principal molecular constants are as follows:[Formula: see text]Calculated dissociation energies based on the above constants and observed Tc suggest that X1Σ and A1Π have a common dissociation limit, As+(3P) + S(3P). In the upper state several perturbations have been found.

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.

THE EMISSION SPECTRUM OF THE CCI RADICAL

1961 ◽  
Vol 39 (2) ◽  
pp. 252-262 ◽  
Author(s):  
R. D. Gordon ◽  
G. W. King
Keyword(s):  
Emission Spectrum ◽  
Emission Band ◽  
Microwave Discharge ◽  
Vibrational Analysis ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Combining States

A rotational analysis of the 2780 Å emission band obtained in a microwave discharge through CCl4 vapor and photographed on a 20-ft grating spectrograph shows that a 2Δi(b) → 2Πr(a) transition of the CCl radical is responsible, not 2Σ → 2Π(a) as reported by previous workers. Molecular constants are given for the combining states, as well as a vibrational analysis that identifies the 2780 Å band as the (0–0) band.

The emission spectrum of the CO2+ ion: rovibronic analysis of the band system

1979 ◽  
Vol 57 (10) ◽  
pp. 1634-1649 ◽  
Author(s):  
D. Gauyacq ◽  
C. Larcher ◽  
J. Rostas
Keyword(s):  
Experimental Data ◽  
Emission Spectrum ◽  
Band System ◽  
Theoretical Models ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Bending Vibration ◽  
Triatomic Molecules ◽  
First Time ◽  
Accurate Experimental Data

The Renner–Teller structure of the [Formula: see text] and Ã2Πu states of the CO2+ ion has been studied thanks to the identification and rotational analysis of the vibronic bands of the [Formula: see text] and [Formula: see text] systems, associated with the first quantum of the bending vibration in the [Formula: see text], Ã, and [Formula: see text] states. The bending structure of the à state has been understood and the corresponding parameters ω2 and ε have been determined for the first time. The simultaneous analysis of the 12CO2+ and 13CO2+ appropriate bands has led us to revise our earlier value of the Renner parameter for the [Formula: see text] state, derived from the [Formula: see text] system. In addition, three bands of the main progression ν′00–000 (ν′ = 0, 1, and 2) have been reanalyzed in order to obtain a consistent set of molecular parameters. The main molecular constants (in cm−1; r0 in Å) are summarized below for 12CO2+:[Formula: see text]The accurate experimental data derived from the CO2+ spectrum are discussed in the framework of the most recent theoretical models of the rovibronic structure of linear triatomic molecules.

THE EMISSION SPECTRUM OF THE PbBr MOLECULE

1967 ◽  
Vol 45 (11) ◽  
pp. 3663-3666 ◽  
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Emission Spectrum ◽  
Visible Region ◽  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The emission spectrum of the A–X system of the PbBr molecule in the region 4 600–5 900 Å has been obtained in the second order of a 21-ft concave grating spectrograph (15 000 lines per inch) with a dispersion of 1.25 Å/mm. A rotational analysis of four bands—(3, 2), (2, 2), (3, 1), and (4, 1)—of this system has been done, leading to the determination of the following rotational constants:[Formula: see text]The system appears to be similar to the A-X system of the PbCl molecule in the visible region, and a [Formula: see text] transition has been suggested.

THE EMISSION SPECTRUM OF ALUMINUM MONOFLUORIDE. II

1954 ◽  
Vol 32 (3) ◽  
pp. 246-258 ◽  
Author(s):  
S. M. Naudé ◽  
T. J. Hugo
Keyword(s):  
Emission Spectrum ◽  
Spectral Region ◽  
Single Band ◽  
The Other ◽  
Rotational Analysis ◽  
Infrared Spectral Region ◽  
Infrared Spectral

Four new band systems of the emission spectrum of AlF are described, viz. the DlΔ – A1II system in the yellow-green, the F1II – A1II and G1Σ – A1II systems in the blue, and the F1II – B1Σ system in the infrared spectral region. A vibrational as well as a rotational analysis of the D1Δ –A1II system is reported. The rotational analyses of the other systems, each of which consists of a single band, are described.

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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