A new electronic transition C2πr–A2πi, of AlO

1982 ◽  
Vol 60 (12) ◽  
pp. 1730-1742 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Electronic Transition ◽  
High Frequency ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
High Frequency Discharge

Several weak bands of AlO, degraded to the violet and occurring as wide doublets 200 cm−1 apart, have been observed in the region 3300–4000 Å, in emission from a high frequency discharge through a flowing mixture of AlCl3 vapour, oxygen, and argon. These bands have been identified as due to a new electronic transition C2πr–A2πi of AlO. This has been confirmed from a detailed rotational analysis of the 1–0 and 0–1 bands (heads, respectively, at 3481.92, 3506.09 Å and 3683.30, 3710.98 Å) from high resolution spectra. Numerous rotational perturbations have been found in both the C2π3/2 and C2π1/2 substates. Effective rotational constants have been determined for these substates. Λ-doubling has been observed even in the substate C2π3/2.

ROTATIONAL ANALYSIS OF FOUR BANDS OF THE A–X SYSTEM OF BiO IN THE NEAR ULTRAVIOLET

1966 ◽  
Vol 44 (4) ◽  
pp. 705-712 ◽  
Author(s):  
Y. K. Sarat Chandra Babu ◽  
P. Tiruvenganna Rao
Keyword(s):  
High Frequency ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
First Order ◽  
High Frequency Discharge ◽  
Near Ultraviolet ◽  
Concave Grating

A rotational analysis of the four bands (0, 1), (0, 2), (0, 3), and (0, 4) of the near ultraviolet system of BiO in the region λ 3 860–λ 3 130 Å has been carried out. The bands have been excited in a high-frequency discharge and photographed in the first order of a 21-ft concave-grating spectrograph (30 000 lines per inch) with a dispersion of 1.25 Å/mm. The analysis has shown that the bands arise from a case (c) 1/2(2Π1/2)–1/2(2II1/2) transition. The rotational constants of the upper and lower states have been determined.

Spectre d'émission du radical P2 : étude de la transition b′3Σu−–X1Σg+

1974 ◽  
Vol 52 (21) ◽  
pp. 2143-2149 ◽  
Author(s):  
J. Brion ◽  
J. Malicet ◽  
H. Guenebaut
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Electronic Transition ◽  
Spin Splitting ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Vibrational Levels

The emission spectrum of the b′3Σu−–X1Σg+ system between 3540–4375 Å and ascribed previously by Mrozowski and Santaram to the a3Σu+–X1Σg+ transition of the P2 molecule, has been photographed under high resolution. The rotational analysis of 7 bands has been carried out and allowed us to determine the rotational constants of the vibrational levels ν′ = 0, 1, and 2 as well as the spin splitting constants λ′ and γ′. The nature of the upper state has been identified as a 3Σu− state, the electronic transition being analogous to the Ogawa–Tanaka–Wilkinson system of N2.

The d3Σ–a3Πr Transition of SiO

1974 ◽  
Vol 52 (7) ◽  
pp. 569-574 ◽  
Author(s):  
M. Singh ◽  
H. Bredohl ◽  
F. Remy ◽  
I. Dubois
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
High Resolution Spectrum ◽  
Initial State ◽  
Final State ◽  
Rotational Constants ◽  
High Frequency Discharge ◽  
Low Pressures

The triple headed and violet degraded band of SiO at 2970 Å has been excited in a high frequency discharge through a mixture of SiCl4, oxygen, and argon flowing at low pressures. From a study of the high resolution spectrum, this band has been assigned to a 3Σ–3Π transition. The final state has been identified with the well known a3Πr state of SiO, and the initial state has been designated as the d3Σ and located at 33 640 cm−1 above the a3Πr. The rotational constants determined for the d3Σ state are (in cm−1): [Formula: see text]

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 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.

The A2Π–X2Σ+ system of MgCl

1987 ◽  
Vol 65 (12) ◽  
pp. 1594-1603 ◽  
Author(s):  
M. Singh ◽  
G. S. Ghodgaonkar ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Structure Analysis ◽  
Vibrational Level ◽  
High Frequency ◽  
Low Frequency ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
The Common ◽  
Π State

The A2Π–X2Σ+ system of MgCl has been photographed at high resolution and analyzed for the rotational structure. Analysis of the low-frequency sub-bands of the 0–0, 0–1, and 0–2 bands showed that there is a nonzero Λ doubling in the common vibrational level ν′ = 0, thereby indicating that the A2Π state is regular and not inverted as presumed by earlier workers. Spin-doubling has been seen in the ν = 1 and 2 levels of the X2Σ+ state. Rotational analysis of the high-frequency sub-band has also been done for the 0–0 band.

High-resolution studies of the near-ultraviolet bands of oxygen: III: the system

1986 ◽  
Vol 64 (6) ◽  
pp. 726-732 ◽  
Author(s):  
B. Coquart ◽  
D. A. Ramsay
Keyword(s):  
High Resolution ◽  
Electron Configuration ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Rotational Constants ◽  
Near Ultraviolet ◽  
Path Lengths

Ten bands of the [Formula: see text] system of oxygen have been observed in absorption using longer path lengths than in the earlier work of Herzberg (1953). Rotational analysis of the bands confirms that the A′ 3Δu state is an inverted state as expected from electron-configuration arguments. Rotational assignments are given for the [Formula: see text] and [Formula: see text] sub-bands with ν′ = 2–11; weaker [Formula: see text] sub-bands are identified for ν′ = 5–11. Sub-band origins and rotational constants are given for all the bands. The following derived molecular constants are obtained:[Formula: see text]A comparison of the frequencies of the diffuse bands of oxygen with the sub-band origins of the [Formula: see text] bands shows convincingly that the diffuse bands can be assigned to a weak (O2)2 complex in which one of the O2 molecules is excited to the A′ 3Δu state.

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.

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.

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