THE b1Σ+–X3Σ− BAND SYSTEM OF NCl

1967 ◽  
Vol 45 (2) ◽  
pp. 301-309 ◽  
Author(s):  
R. Colin ◽  
W. E. Jones
Keyword(s):  
High Resolution ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Isotopic Shifts

When a mixture of N2 and Cl2 is pumped rapidly through a mild microwave discharge, an orange afterglow is observed downstream from the discharge. The spectrum of this weak emission consists of a prominent double-headed band, the strongest head lying at 6 648.6 Å, and a number of weaker similar bands forming three sequences. Observed isotopic shifts have been used to identify the emitter as NCl. The rotational analysis of the strongest (0–0) band, photographed with high resolution, shows that these bands represent the b1Σ+–X3Σ− transition of the NCl molecule. The vibrational and rotational constants were determined for both states; we find ωe′ = 935.6 cm−1, ωo″ = 827.0 cm−1, γ0′ = 1.565 3 Å, and γ0″ = 1.608 3 Å.

The rotational analysis of the A1Π–X1Σ+ system of Si130Te

1992 ◽  
Vol 70 (5) ◽  
pp. 291-294 ◽  
Author(s):  
Sheila Gopal ◽  
M. Singh ◽  
G. Lakshminarayana
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Structure ◽  
Quartz Tube ◽  
Rotational Analysis ◽  
Rotational Constants

The emission spectrum of Si130Te was excited by microwave discharge (2450 MHz) in a sealed quartz tube. The A1Π–X1Σ+ band system (3100–3900 Å) (1 Å = 10−10 m) photographed under high resolution on a 10.6 m Ebert grating spectrograph. The rotational analysis of 32 bands was carried out, which led to the determination of the accurate vibrational and rotational constants. The rotational structure belonging to ν′ > 9 levels appear to be perturbed.

Spectrum of SO: Analysis of the B3Σ−–X3Σ− and A3 Π–X3Σ− band systems

1969 ◽  
Vol 47 (9) ◽  
pp. 979-994 ◽  
Author(s):  
R. Colin
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Microwave Discharge ◽  
Flash Photolysis ◽  
Band System ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Π State

The absorption spectrum of SO radicals produced by flash photolysis of a mixture of COS + O2 + Ar is investigated. A partial rotational analysis of the previously known bands of the B3Σ−–X3Σ− transition which lie in the region of 1900 to 2400 Å is presented, and the predissociations and perturbations of the B3Σ−state are discussed. A complex red-degraded band system near 2500 Å, previously observed in emission and attributed to SO2, is shown to be due to a 3Π–X3Σ− transition of the SO molecule. Effective rotational constants of the 3Π state are derived from the analysis of these bands photographed at high resolution. In order to obtain the vibrational numbering of the 3Π–X3Σ− bands, these were also photographed in emission from a microwave discharge through a mixture of S18O2 + S16O2. A general discussion of the currently known states of the SO molecule is given.

The b1Σ+–X3Σ− band system of SO

1968 ◽  
Vol 46 (13) ◽  
pp. 1539-1546 ◽  
Author(s):  
R. Colin
Keyword(s):  
High Resolution ◽  
Microwave Discharge ◽  
Band System ◽  
Rotational Constants

The 0–0, 1–1, 2–2, and 0–1 bands of the b1Σ+–X3Σ− transition of the SO molecule have been observed in the afterglow produced when COS + O2 is pumped rapidly through a microwave discharge. The two strongest bands, 0–0 and 1–1, which lie respectively at 9549.08 and 9626.13 Å, have been photographed at high resolution and have been analyzed. Using the known X3Σ− rotational constants, the vibrational and rotational constants of the 1Σ+ state (Tc = 10 509.97 cm−1) have been determined: ωc′ = 1067.66 cm−1, Bc′ = 0.70262 cm−1, and rc′ = 1.5005 Å. Rotational intensity distributions for 1Σ+–3Σ− transitions are discussed. The a1Δ state of SO is predicted to lie at T ~ 6350 cm−1.

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.

High-resolution studies of the Herzberg band system (C1Σ+ – A1Π]) in the 13C18O molecule

1988 ◽  
Vol 66 (11) ◽  
pp. 1012-1024 ◽  
Author(s):  
R. Kępa
Keyword(s):  
High Resolution ◽  
Band System ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Combined Analysis ◽  
Isotopic Molecule ◽  
Vibrational Constants ◽  
First Time ◽  
Π State

Seven bands ((0–0) – (0–6)) belonging to the Herzberg system of 13C18O have been recorded in emission using conventional photographic spectroscopy. For the first time, lines of this system have been recorded at high resolution and identified. After the rotational analysis of bands, the rotational constants of the C1Σ+ (ν = 0) and A1Π (ν = 0–6) states, as well as the vibrational constants of the A1Π state, have been determined. A combined analysis of the bands of the Herzberg and Ångström systems have made it possible to determine the constants of the B1Σ+ state more precisely. Numerous rotational perturbations observed in the A1Π state in this isotopic molecule have been analyzed.

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.

The 4875 Å Band System of cis Glyoxal

1971 ◽  
Vol 49 (3) ◽  
pp. 317-322 ◽  
Author(s):  
G. N. Currie ◽  
D. A. Ramsay
Keyword(s):  
High Resolution ◽  
Trans Isomer ◽  
Band System ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Rotational Constants ◽  
Type C ◽  
First Time ◽  
Cis Isomer

The 4875 Å band of glyoxal has been photographed in absorption under high resolution and a rotational analysis carried out. The band is of type C and the principal molecular constants are: A′ = 0.9069 cm−1, B′ = 0.1983 cm−1, C′ = 0.1627 cm−1, A″ = 0.8910 cm−1, B″ = 0.2066 cm−1, C″ = 0.1681 cm−1, v0 = 20 507.57 cm−1. The A-rotational constants are smaller by a factor of ~2 than the constants found earlier for trans glyoxal. The new results are consistent with the assignment of the band to an allowed 1B1–1A1 (π*–n) transition of cis glyoxal. Temperature studies indicate that the cis isomer lies 1125 ± 100 cm−1 above the trans isomer. This is the first time that cis glyoxal has been detected experimentally.

STRUCTURE OF THE BAND SPECTRUM OF THE CuI MOLECULE: I. ROTATIONAL STRUCTURE OF THE E SYSTEM OF 63Cu127I

1966 ◽  
Vol 44 (10) ◽  
pp. 2241-2245 ◽  
Author(s):  
P. Ramakoteswara Rao ◽  
K. V. S. R. Apparao
Keyword(s):  
High Resolution ◽  
Electronic Transition ◽  
Band System ◽  
Rotational Structure ◽  
Band Spectrum ◽  
Rotational Analysis ◽  
Rotational Constants

The E band system of 63Cu127I, lying in the region 3 700 to 4 700 Å, has been photographed in emission under high resolution. Rotational analysis of the (0–4), (0–3), (0–2), (0–1), (0–0), (1–1), (1–0), (2–0), and (3–2) bands has been made. The electronic transition involved is found to be 1Σ (E1Σ)–1Σ(X1Σ). The rotational constants obtained are as follows:[Formula: see text]

ROTATIONAL ANALYSIS OF THE β BANDS OF PHOSPHORUS MONOXIDE

1959 ◽  
Vol 37 (2) ◽  
pp. 136-143 ◽  
Author(s):  
Nand Lal Singh
Keyword(s):  
Ground State ◽  
Band System ◽  
Electronic States ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Fine Structures ◽  
Π State

The fine structures of three of the β bands of PO which occur near 3200 Å have been analyzed. The analysis shows that the upper state of this band system is a 2Σ and not a 2Π state as previously believed. The rotational constants of both electronic states have been determined and it is found that the ground state constants, previously determined from the γ bands, are incorrect.

ROTATIONAL ANALYSIS OF THE VISIBLE BAND SYSTEM OF THE BiF MOLECULE

1962 ◽  
Vol 40 (9) ◽  
pp. 1077-1084 ◽  
Author(s):  
T. A. Prasada Rao ◽  
P. Tiruvenganna Rao
Keyword(s):  
Band System ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Visible Band ◽  
System A

A rotational analysis of five bands, (1,0), (0,0), (0,1), (0.2), and (0,3), of the visible band system A of BiF has been carried out by photographing the bands under high dispersion (1.25 Å/mm). The analysis has shown that the bands arise from a 0+(3Σ−)–0+(3Σ−) transition. The rotational constants for the upper and lower states of the system are obtained.

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