Improved Molecular Constants of Acetylene Obtained from the v5 Band System

1990 ◽  
Vol 45 (8) ◽  
pp. 946-952 ◽  
Author(s):  
A. Moravec ◽  
G. Winnewisser ◽  
K. M. T. Yamada ◽  
C. E. Blom
Keyword(s):  
High Resolution ◽  
Band System ◽  
Natural Abundance ◽  
Molecular Constants ◽  
Bending Vibration ◽  
Fundamental Band ◽  
Rotation Band ◽  
Isotopic Species ◽  
Hot Band ◽  
Vibration Rotation

Abstract A vibration-rotation band system of acetylene of the /Πu bending vibration v5 has been recorded with high resolution by a Bruker IFS 120 HR Michelson spectrometer. From the analysis of the hot band of the normal isotopic species, v4 + v5 - v4, and the fundamental band of HC13CH in natural abundance an improved set of constants has been derived. The intensity perturbation due to the l-type resonance has been clearly observed in the band system v4 + v5 -v4

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

1975 ◽  
Vol 53 (14) ◽  
pp. 1321-1326 ◽  
Author(s):  
M. Carleer ◽  
M. Herman ◽  
R. Colin
Keyword(s):  
High Resolution ◽  
Hollow Cathode ◽  
Band System ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Bromine Vapor

A rotational analysis has been performed on the 0–0 band of the A2Π–X2Σ+ transition of the BeBr molecule photographed at high resolution in emission from a beryllium hollow cathode in the presence of bromine vapor. The following principal molecular constants have been determined:[Formula: see text]

A high-resolution study and analysis of the ν2 NH3 vibration-rotation band

1959 ◽  
Vol 15 ◽  
pp. 313-330 ◽  
Author(s):  
H.M. Mould ◽  
W.C. Price ◽  
G.R. Wilkinson
Keyword(s):  
High Resolution ◽  
Rotation Band ◽  
Vibration Rotation ◽  
Resolution Study

STRUCTURE OF THE BAND SPECTRUM OF THE CuBr MOLECULE: I. ROTATIONAL STRUCTURE OF THE C SYSTEM OF 63Cu81Br

1967 ◽  
Vol 45 (8) ◽  
pp. 2805-2807 ◽  
Author(s):  
P. Ramakoteswara Rao ◽  
K. V. S. R. Apparao
Keyword(s):  
Fine Structure ◽  
High Resolution ◽  
Structure Analysis ◽  
Band System ◽  
Rotational Structure ◽  
Band Spectrum ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Fine Structure Analysis

The C band system of 63Cu81Br, lying in the region 3 900–4 600 Å, has been photographed in emission under high resolution and rotational analysis of the (2–0), (1–0), (0–0), (0–1), (0–2), and (1–3) bands carried out. The system is shown to involve a 1Σ(C1Σ)–1Σ(X1Σ) transition. The molecular constants of 63Cu81Br obtained from this fine-structure analysis are as follows:[Formula: see text]

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 blΣ+–X3Σ− band system of the PBr molecule

1979 ◽  
Vol 57 (7) ◽  
pp. 1051-1058 ◽  
Author(s):  
R. Colin
Keyword(s):  
High Resolution ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Analysis ◽  
Molecular Constants

Six bands of the b1Σ+–X3Σ− transition of the PBr molecule have been observed in a microwave discharge of PBr3 + He. High resolution spectra have allowed the rotational analysis of the 0–0 and 1–1 bands. The principal molecular constants obtained are:X3Σ−: P79Br; ωe = 458.35 cm−1, Be = 0.16067 cm−1; P81Br; ωe = 457.78 cm−1, Be = 0.15958 cm−1; re = 2.1714 Å.B1Σ+: P79Br; ωe = 485.47 cm−1, Be = 0.16509 cm−1; P81Br; ωe = 483.84 cm−1, Be = 0.16399 cm−1; re = 2.1421 Å and Te = 11779.75 cm−1.

Diode Laser Spectrum of HCCCN near 5 pm * The Hot Band

1981 ◽  
Vol 36 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Koichi Yamada ◽  
Gisbert Winnewisser
Keyword(s):  
Diode Laser ◽  
Doppler Broadening ◽  
Laser Spectrometer ◽  
Spectral Parameters ◽  
Laser Spectrum ◽  
Rotation Band ◽  
Diode Laser Spectrometer ◽  
Hot Band ◽  
Vibration Rotation

Two hot bands associated with the vs vibration-rotation band of cyanoacetylene, HC3N, have been measured with a diode laser spectrometer in the 2060- 2100 cm-1 range. Since the width of the observed lines is essentially determined by Doppler broadening, the splitting of the hot band rovibrational transitions due to l-type doubling could be resolved and was assigned. Improved spectral parameters were obtained, including the anharmonicity parameters

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