Emission Spectrum of the PO Molecule. Part III. Spectrum in the Red Region

1972 ◽  
Vol 50 (13) ◽  
pp. 1579-1586 ◽  
Author(s):  
S. Guha ◽  
S. S. Jois ◽  
R. D. Verma
Keyword(s):  
Emission Spectrum ◽  
Structure Study ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
Vibrational Levels ◽  
Π State

Four new bands in the red region are observed which have been described in terms of A2Σ+–B2Σ+ and F2Σ+–B2Σ+ systems. A rotational analysis together with deperturbation calculation of one band at 6763 Å has shown that A2Σ+ (ν = 7) and F2Σ+ (ν = 0) vibrational levels are involved in a homogeneous perturbation. The rotational structure study of three bands of a new transition I2Σ+–A2Σ+ has been carried out. From the study of heterogeneous perturbations observed in the I vibrational levels, it has been suggested that the perturbing state is a 2Π state arising from the 3d complex.

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.

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.

Further results relating to the electronic spectrum of 175Lu16O

1986 ◽  
Vol 64 (3) ◽  
pp. 246-251 ◽  
Author(s):  
A. Bernard ◽  
C. Effantin
Keyword(s):  
Least Squares ◽  
Electronic Spectrum ◽  
Ground State ◽  
Rotational Analysis ◽  
Least Squares Fitting ◽  
Fitting Procedure ◽  
Vibrational Levels ◽  
Unique Band ◽  
Π State ◽  
New System

Further results are presented concerning the three known systems of the molecule LuO; i.e., A2Π, B2Π, C2Σ+ → X2Σ+. The observed wavenumbers in each of the 12 analyzed bands are reduced using an iterative, least squares fitting procedure. Rotational constants are given for vibrational levels ν = 0 and 1 in the C state and up to ν = 7 in the X and B states. The 1–1 band of the A → X system is partly analyzed. These new calculations confirm level B to be the 3/2 component of a 2Π state; but they give no such confirmation for the identification of the A level, whose 2Π nature is well established, as the 1/2 component of the same state.Moreover, a unique band at 5120 Å that cannot be classified into any of the three known systems is described and attributed to a new system of LuO. A partial rotational analysis is made showing that the band corresponds to a transition involving the level ν = 0 in the ground state. The nature of the upper state is discussed.

Rotational analysis of the A0 + , B0 + ← X 1 Ʃ + systems of gaseous AgF

1971 ◽  
Vol 322 (1549) ◽  
pp. 243-249 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Dissociation Energy ◽  
Ground State ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
Vibrational Levels

The absorption spectrum of AgF in the region 300.0 to 355.0 nm consists of a continuum centred at about 303.0 nm and two-band systems, A0 + , and B0 + ← X 1 Ʃ + . Rotational analyses have been made for all seven bands observed in the A─X system and of four bands in the B─X system, for both 107 AgF and 109 AgF. State A seems to have a very low dissociation energy and may possess only two stable vibrational levels. Lines at high J appear diffuse, indi­cating predissociation, perhaps by rotation. State B is also predissociated and only the bands with v ' ═ 0 show sharp rotational structure. The predissociating state is probably an Ω ═ 1 state which is the upper state of the 303.0 nm continuum. Constants for the ground state of 107 AgF are as follows: G v ═ 513.447 ± 0.009 ( v + ½) ─ 2.593 ± 0.002 ( v + ½) 2 B v ═ 0.26567 ─ 0.001901± 8 ( v + ½).

New results on the D2Π and B′2Π states of the PO molecule

1976 ◽  
Vol 54 (6) ◽  
pp. 695-708 ◽  
Author(s):  
S. Ghosh ◽  
S. Nagaraj ◽  
R. D. Verma
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Vibrational Level ◽  
Rotational Analysis ◽  
X Band ◽  
Vibrational Levels ◽  
Π State

A rotational analysis of the D–X and D′–X band systems of PO in the region 1900–2100 Å has been reinvestigated from an absorption spectrum taken at high resolution. A new ν = 1 vibrational level of the D2Π state of PO interacting with a new vibrational level of the D′2Π state has been studied in detail. Two other new vibrational levels, ν = 2 and 3, of D2Π have been recorded and studied in detail. A rigorous deperturbation of the D and D′ levels has been carried out. It has been shown that D′2Π and B′2Π are one and the same state of the PO molecule. A new band overlapped by the D′–X, 26–0 band has been attributed to the B2Σ+–X2Π transition.

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]

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.

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 A–X System of the SiCl Molecule

1971 ◽  
Vol 49 (4) ◽  
pp. 407-411 ◽  
Author(s):  
S. R. Singhal ◽  
R. D. Verma
Keyword(s):  
Ground State ◽  
Electronic States ◽  
Rotational Structure ◽  
Spin Coupling ◽  
Quartz Tube ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Molecular Constants ◽  
Vibrational Levels

The A–X system of the SiCl molecule in the region 4500–6400 Å has been excited by an r.f. discharge through a mixture of argon and a trace of SiCl4 vapor, flowing through a quartz tube. Several red degraded and double headed bands with ν′ = 0, 1, 2, and 3 have been observed and the rotational structure of the 0-5, 0-6, 0-7, 0-8, 0-9, 0-10, 1-9, and 1-10 bands has been analyzed. The analysis shows that the bands arise from a 2Σ–2Π transition, 2Π being the ground state of the molecule. The molecular constants have been determined for both the electronic states. The spin coupling constant, Aν, of the X2Π vibrational levels has been found to follow an equation[Formula: see text]

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