THE EMISSION SPECTRUM OF THE PbBr MOLECULE

1967 ◽  
Vol 45 (11) ◽  
pp. 3663-3666 ◽  
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Emission Spectrum ◽  
Visible Region ◽  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The emission spectrum of the A–X system of the PbBr molecule in the region 4 600–5 900 Å has been obtained in the second order of a 21-ft concave grating spectrograph (15 000 lines per inch) with a dispersion of 1.25 Å/mm. A rotational analysis of four bands—(3, 2), (2, 2), (3, 1), and (4, 1)—of this system has been done, leading to the determination of the following rotational constants:[Formula: see text]The system appears to be similar to the A-X system of the PbCl molecule in the visible region, and a [Formula: see text] transition has been suggested.

ROTATIONAL ANALYSIS OF THE VISIBLE EMISSION BANDS OF THE PbF MOLECULE

1964 ◽  
Vol 42 (4) ◽  
pp. 690-695 ◽  
Author(s):  
K. Madhusudana Rao ◽  
P. Tiruvenganna Rao
Keyword(s):  
Band System ◽  
Second Order ◽  
Rotational Structure ◽  
Visible Emission ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Visible Band ◽  
System A ◽  
Concave Grating

The rotational structure of the (0, 0), (0, 1), (0, 2), and (1, 0) bands of the visible band system (A–X1) of PbF has been examined in the second order of a 21-ft concave grating spectrograph having a dispersion of 1.25 Å/mm. A rotational analysis of the bands has led to a determination of the rotational constants of the upper and lower states. From consideration of electron configurations it is suggested that the system arises from a [Formula: see text] transition which is a case c equivalent of [Formula: see text].

Rotational Analysis of B–X2 System of 208PbF

1972 ◽  
Vol 50 (18) ◽  
pp. 2206-2210 ◽  
Author(s):  
O. Nath Singh ◽  
I. S. Singh ◽  
O. N. Singh
Keyword(s):  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The rotational analysis of the three bands (1,0), (0,0), and (0,1) of the B–X2 system of PbF has been carried out. The bands have been excited in a transformer discharge and photographed in the second order of a 35 ft concave grating spectrograph. The analysis has shown that the bands arise from a 2Σ+–2Π3/2 transition. The rotational constants of the upper and lower states have been determined.

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.

Rotational analysis of A–X1 bands of PbF

1969 ◽  
Vol 47 (15) ◽  
pp. 1639-1641 ◽  
Author(s):  
O. N. Singh ◽  
M. P. Srivastava ◽  
I. S. Singh
Keyword(s):  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The rotational analysis of the four bands (0,0), (0,1), (0,2), and (1,0) of the A–X1 system of PbF has been carried out. The bands have been excited in a transformer discharge and photographed in the second order of a 35-ft concave grating spectrograph. The analysis has shown that the bands arise from a [Formula: see text] transition. The rotational constants of the upper and lower states have been determined.

A note on the rotational analysis of the A–X system of the PbBr molecule

1968 ◽  
Vol 46 (17) ◽  
pp. 1991-1992
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Second Order ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
Concave Grating

The rotational structure of the A–X system of the PbBr molecule has been recorded in the second order of a 35-ft concave grating spectrograph at a dispersion of 0.33 Å/mm and the analysis of four bands (3, 2), (2, 2), (4, 2), and (4, 1) has been done. In all, four branches have been observed for each of the bands and they have been explained as the P and R branches due to Pb79Br and Pb18Br. The following constants were obtained:[Formula: see text]

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.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: IV. ROTATIONAL RAMAN SPECTRUM OF CYANOGEN

1954 ◽  
Vol 32 (10) ◽  
pp. 635-638 ◽  
Author(s):  
C. K. Møller ◽  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Bond Length ◽  
Second Order ◽  
Single Bond ◽  
Rotational Constants ◽  
A Value ◽  
Symmetric Molecule ◽  
Concave Grating

The rotational Raman spectrum of cyanogen gas at [Formula: see text] atm. pressure has been photographed in the second order of a 21 ft. concave grating spectrograph. The simplicity of the spectrum and the observed intensity alternation of the lines show that C2N2 is a linear symmetric molecule. An analysis of the spectrum yields for the rotational constants[Formula: see text]By assuming a value for the C≡N bond length of 1.157 Å, the length of the C—C single bond was calculated to be 1.380 Å.

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.

Rotational analysis of the A–X bands of AsO+

1969 ◽  
Vol 47 (15) ◽  
pp. 1601-1604 ◽  
Author(s):  
Rama Shanker ◽  
I. S. Singh ◽  
O. N. Singh
Keyword(s):  
Rotational Analysis ◽  
Third Order ◽  
Rotational Constants ◽  
The Third ◽  
Concave Grating

The (1,0) and (2,0) bands of the A–X system of the AsO+ molecule have been recorded in the third order of a 35-ft concave grating spectrograph. The rotational analysis has been carried out and the transition has been found to be 1Π–1Σ. The rotational constants are given.

Rotational Structure in the A2Σ+, B2Σ+, and a4Σ− – X2Π Transitions of GeF

1973 ◽  
Vol 51 (2) ◽  
pp. 125-143 ◽  
Author(s):  
R. W. Martin ◽  
A. J. Merer
Keyword(s):  
Matrix Element ◽  
Ground State ◽  
Electronic States ◽  
Second Order ◽  
Rotational Structure ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Intensity Enhancement ◽  
Perturbation Matrix

Rotational analysis of over 50 sub-bands of three emission transitions of 74GeF has given vibrational and rotational constants for the four lowest-lying electronic states of GeF. One of these is a 4Σ− state in Hund's case (a), where all four spin components have been identified. Extensive perturbations between this 4Σ− state and the B2Σ+ state have been analyzed in detail: the two states appear to interact mainly by a second-order mechanism through the so far uncharacterized σπ22Σ+ state, but the surprisingly large J dependence of the perturbation matrix element suggests that another mechanism, possibly involving the ground state, may contribute. Further perturbations, where the lines show an unusual intensity enhancement, appear in those sub-bands with B2Σ+ ν = 4 as upper state.

Sign in / Sign up

Export Citation Format

Share Document