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.

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.

The Ground State and A2Π Excited State of Magnesium Deuteride

1975 ◽  
Vol 53 (15) ◽  
pp. 1477-1482 ◽  
Author(s):  
Walter J. Balfour ◽  
Hugh M. Cartwright
Keyword(s):  
Excited State ◽  
High Resolution ◽  
Emission Spectrum ◽  
Isotope Effect ◽  
Ground State ◽  
Visible Emission ◽  
Molecular Constants ◽  
Dissociation Energies ◽  
First Time ◽  
Π State

The visible emission spectrum of MgD has been reexamined at high resolution. Published analyses of the A2Π → X2Σ+ system have been extended and the data have been combined with observations in the B′2Σ+ → X2Σ+ system to provide information on the ground state levels ν = 3, 4, 5, and 6 for the first time. The following molecular constants (in cm−1) have been determined—for the A2Π state: ωc = 1154.75, ωcxc = 16.675, Bc = 3.2190, Dc = 9.64 × 10−5 and for the X2Σ+ state: ωc = 1077.71, ωcxc = 15.92, Bc = 3.0306, and Dc = 9.39 × 10−5. The dissociation energies in the A2Π and X2Σ+ states have been estimated to be ~ 15 500 cm−1 and ~ 11 500 cm−1 respectively. The MgH/MgD isotope effect and the Λ doubling in the A2Π state are discussed.

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]

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]

The emission spectrum of SiN

1976 ◽  
Vol 54 (6) ◽  
pp. 680-688 ◽  
Author(s):  
H. Bredohl ◽  
I. Dubois ◽  
Y. Houbrechts ◽  
M. Singh
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Spectral Region ◽  
Electronic States ◽  
Π State

The emission spectrum of SiN has been reinvestigated under high resolution in the spectral region 3100–5600 Å. Besides the well known B2Σ+–X2Σ+, three new transitions have been analyzed, two 2Π–2Π and one 2Σ–2Π. These three transitions have a lower 2Π state in common which appears to be the lowest excited A2Π state. The B2Σ+–X2Σ+ transition has been reinvestigated and rotational perturbations have been found. The constants determined for the various electronic states are given.

Improved Spectroscopic Constants for 14C16O2 Obtained from the ν3 Band

1989 ◽  
Vol 44 (7) ◽  
pp. 633-639 ◽  
Author(s):  
S. Dobos ◽  
G . Winnewisser ◽  
F. Kling ◽  
J. Mink
Keyword(s):  
High Resolution ◽  
Diode Laser ◽  
Spectral Region ◽  
Tunable Diode Laser ◽  
Spectroscopic Constants ◽  
Laser Spectrometer ◽  
Diode Laser Spectrometer ◽  
Medium Resolution ◽  
Carrier Free ◽  
Ftir Spectrometer

The absorption spectra of carrier free 14C16O2 in the spectral range of 2290-2150 cm−1 by a medium resolution FTIR spectrometer, and the spectral region of 2258 − 2229 cm−1 with a high resolution tunable diode laser spectrometer have been recorded. Spectroscopic constants were calculated from the 0001 − 0000 and 0111 −0110 transitions.

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