Vibrational analysis of the 3Π1–X1Σ+ band systems of SiCl+

1981 ◽  
Vol 59 (8) ◽  
pp. 985-989 ◽  
Author(s):  
Masaharu Tsuji ◽  
Toshinori Mizuguchi ◽  
Yukio Nishimura
Keyword(s):  
Emission Spectrum ◽  
Radical Cation ◽  
Thermal Energy ◽  
Vibrational Analysis ◽  
Molecular Constants ◽  
Vibrational Assignments

The emission spectrum of the SiCl+ radical cation, excited by the thermal energy He+ + SiCl4 reaction, has been observed and vibrationally analyzed in the 310–350 nm region. The two new subband systems, [Formula: see text] and a3Π1–X1Σ+, have been identified. The vibrational assignments were confirmed by the observed isotope band heads of Si35Cl+ and Si37Cl+. The following molecular constants (in cm−1) have been obtained for the X1Σ+, [Formula: see text], and a3Π1, states.[Formula: see text]

The a3Π1–X1Σ+ emission system of CBr+

1983 ◽  
Vol 61 (2) ◽  
pp. 251-255 ◽  
Author(s):  
Masaharu Tsuji ◽  
Keiji Shinohara ◽  
Toshinori Mizuguchi ◽  
Yukio Nishimura
Keyword(s):  
Charge Transfer ◽  
Emission Spectrum ◽  
Thermal Energy ◽  
Transfer Reaction ◽  
Vibrational Analysis ◽  
Visible Emission ◽  
Spectroscopic Constants ◽  
Charge Transfer Reaction ◽  
Emission System ◽  
First Time

The visible emission spectrum of the CBr+ molecule has been observed for the first time in the helium afterglow reaction of CBr4. It was excited by the dissociative charge-transfer reaction of He+ with CBr4 at thermal energy. The vibrational analysis led to the following spectroscopic constants (in cm−1).[Formula: see text]

Emission spectra of group IV monohalide ions: , 3Π1–X1Σ+ emissions of SiBr+

1984 ◽  
Vol 62 (4) ◽  
pp. 353-360 ◽  
Author(s):  
M. Tsuji ◽  
K. Shinohara ◽  
S. Nishitani ◽  
T. Mizuguchi ◽  
Y. Nishimura
Keyword(s):  
Thermal Energy ◽  
Vibrational Temperature ◽  
Vibrational Analysis ◽  
Emission Spectra ◽  
Ionic Species ◽  
Group Iv ◽  
Rare Gas ◽  
Molecular Constants ◽  
Vibrational Levels ◽  
Effective Vibrational Temperature

Emission spectra of SiBr4 in the rare gas flowing afterglows have been measured to detect and identify SiBr+ emissions. Two systems of SiBr+ emissions were detected in the He, Ne, and Ar afterglows in the region from 335 to 380 nm. By analogy with the emission spectrum of SiCl+, they were ascribed to the [Formula: see text]–X1Σ+ and a3Π1–X1Σ+ subsystems of SiBr+. The vibrational analysis of the latter system gave the following molecular constants for the a3Π1 state: T0 = 29 140 ± 5 cm−1 and ΔG(1/2) = 392.0 ± 3.7 cm−1. The SiBr+ emissions disappeared when ionic species were removed from the afterglows, indicating that the emitting SiBr+ states were produced through thermal-energy reactions of rare gas ions with SiBr4. In the He and Ne afterglows, the [Formula: see text] ions were produced in higher vibrational levels than in the Ar afterglow. The relative vibrational populations in the He and Ne afterglows were nearly exponential with an effective vibrational temperature of 460 ± 30 K.

THE ELECTRONIC EMISSION SPECTRUM AND MOLECULAR CONSTANTS OF IODINE MONOFLUORIDE

1966 ◽  
Vol 44 (2) ◽  
pp. 337-352 ◽  
Author(s):  
R. A. Durie
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Dissociation Energy ◽  
Band System ◽  
Vibrational Analysis ◽  
Rotational Structure ◽  
Molecular Constants ◽  
Present Evidence ◽  
Halogen Compounds ◽  
Concave Grating

Observation by the author (Durie 1951) of a well-developed band system in the emission from an iodine–fluorine flame provided the first evidence for the existence of iodine monofluoride (IF), the last of the six possible diatomic inter-halogen compounds to be detected. The spectrum, which lies in the region 4 300 to 7 600 Å, has since been photographed under high resolution using a 21-ft concave grating spectrograph. The rotational structure of the bands is shown to be consistent with an A3Π0+ → X1Σ transition in the IF molecule. A rotational and vibrational analysis of the bands has been carried out and the molecular constants evaluated for IF. The results are as follows:[Formula: see text]The present evidence relating to the value of the dissociation energy of IF is discussed.

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.

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.

Group vibrations and the vibrational analysis of molecules containing methylene groups. Part II. Ethylene oxide, d4-ethylene oxide, and ethylene sulfide

1968 ◽  
Vol 46 (12) ◽  
pp. 2135-2139 ◽  
Author(s):  
J. M. Freeman ◽  
T. Henshall
Keyword(s):  
Ethylene Oxide ◽  
Vibrational Analysis ◽  
Vibrational Assignments ◽  
Group Frequency ◽  
Methylene Groups

Vibrational analyses, based on the group frequency factorization procedure of King and Crawford, are reported for ethylene oxide, d4-ethylene oxide, and ethylene sulfide in an attempt to decide between two possible vibrational assignments for these molecules.The results, whilst not providing an unequivocal decision between the assignments, nevertheless do suggest that the higher frequencies in the A2 and B2 species may be preferentially assigned to the methylene rocking modes.

Observation of the BBr+ emission spectrum: vibrational analysis of the A2Π12 − X2Σ+ system

1987 ◽  
Vol 138 (1) ◽  
pp. 29-32 ◽  
Author(s):  
Sumio Yamaguchi ◽  
Masaharu Tsuji ◽  
Yukio Nishimura
Keyword(s):  
Emission Spectrum ◽  
Vibrational Analysis

Emission spectrum of tri-B-fluoroborazine radical cation in the gas phase: ~A2A2'' .fwdarw. ~X2E'' band system

1979 ◽  
Vol 18 (8) ◽  
pp. 2140-2142 ◽  
Author(s):  
Taylor B. Jones ◽  
John P. Maier ◽  
Oskar Marthaler
Keyword(s):  
Emission Spectrum ◽  
Gas Phase ◽  
Radical Cation ◽  
Band System
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