ROTATIONAL ANALYSIS OF THE γ SYSTEM OF THE PO MOLECULE

1958 ◽  
Vol 36 (11) ◽  
pp. 1526-1535 ◽  
Author(s):  
K. Suryanarayana Rao
Keyword(s):  
Ground State ◽  
Electronic Transition ◽  
Lower State ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Small Perturbations ◽  
Rotational Constants ◽  
The One

The bands of the γ system of the PO molecule have been photographed under high dispersion (0.35 Å/mm). A rotational analysis of the 0–0, 0–1, and 1–0 bands is given, which differs from the one previously given by Sen Gupta. In addition, four more bands, namely, the 1–2, 2–1, 2–3, and 2–4 bands, have been analyzed. The bands are attributed to the electronic transition, A3Σ–X2Πreg, the lower state being the ground state of the molecule. The new rotational constants for the ground state are the following:[Formula: see text]The spin doubling in the upper state is small. Perturbations in the v = 0 level of the upper state, which were not reported previously, are observed and discussed. They supply a welcome confirmation of the correctness of the analysis here presented.

Rotational analysis of bands of the 3400 Å system of disulphur monoxide (S2O)

1977 ◽  
Vol 55 (21) ◽  
pp. 1858-1867 ◽  
Author(s):  
K-E. J. Hallin ◽  
A. J. Merer ◽  
D. J. Milton
Keyword(s):  
Electronic Transition ◽  
Flow System ◽  
Type A ◽  
High Dispersion ◽  
Rotational Analysis ◽  
State Structure ◽  
Intensity Pattern ◽  
Rotational Constants ◽  
Long Wavelength

S2O has been prepared in a flow system, and various bands at the long wavelength end of the 3400 Å electronic transition photographed in absorption at high dispersion. Rotational analysis of the bands at 3235 and 3278 Å has shown that the bands are type A–B hybrids, with the type A component accounting for nearly all the observed structure. The electronic transition is therefore 1A′–1A′ (ππ*). The rotational constants imply the upper state structure r(S—S) = 2.14 Å, [Formula: see text], with r(S—O) = 1.50 Å (assumed).The vibrational intensity pattern is found to be in agreement with this structure if the electronic origin is placed at 29 696 cm−1 (3367 Å).

A 4Σ−–2Π TRANSITION OF THE SiF MOLECULE

1962 ◽  
Vol 40 (5) ◽  
pp. 586-597 ◽  
Author(s):  
R. D. Verma
Keyword(s):  
High Resolution ◽  
Ground State ◽  
Electronic States ◽  
Lower State ◽  
Rotational Analysis ◽  
Rotational Constants

The η bands of SiF, in the region 3300–3400 Å, have been photographed in emission at high resolution. A detailed rotational analysis has shown that these bands represent a 4Σ−–2Πτ transition. The lower state is the ground state of the molecule. The principal rotational constants of the upper and lower electronic states in cm−1 are as follows:[Formula: see text]A discussion of the electron configurations is also given.

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.

THE b1Σ+–X3Σ− BAND SYSTEM OF NF

1966 ◽  
Vol 44 (10) ◽  
pp. 2251-2258 ◽  
Author(s):  
A. E. Douglas ◽  
W. E. Jones
Keyword(s):  
Ground State ◽  
Band System ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Strong Band

If argon mixed with a small amount of NF3 is pumped rapidly through a mild discharge, a green glow is observed downstream from the discharge. This emission has been photographed with a high dispersion spectrograph and found to consist of a strong band with a head at 5 288 Å and a number of weaker bands. A rotational analysis of the bands has shown that they are the b1Σ+–X3Σ− bands of the NF molecule. The constants of the two states have been determined and it is found that for the ground state, ωe = 1 141.37 cm−1 and re = 1.317 3 Å.

A 3Σ–3Π transition of the SiO molecule

1970 ◽  
Vol 48 (12) ◽  
pp. 1436-1440 ◽  
Author(s):  
S. Nagaraj ◽  
R. D. Verma
Keyword(s):  
Quartz Tube ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Single Sequence

The spectrum in the region 4200–4300 Å, attributed to the SiO molecule, has been excited strongly in a r.f. discharge through a mixture of argon and a trace of SiCl4 vapor flowing through a quartz tube. The spectrum consists of a single sequence Δν = 0. The 0–0 and 1–1 bands have been photographed at high dispersion. A rotational analysis of these bands shows that they involve a 3Σ–3II transition and not a 1Σ–3Π transition as reported earlier. The following rotational constants were determined:[Formula: see text]

A NEW BAND SYSTEM OF THE P2 MOLECULE ANALOGOUS TO THE LYMAN–BIRGE–HOPFIELD BANDS OF N2

1958 ◽  
Vol 36 (5) ◽  
pp. 565-570 ◽  
Author(s):  
A. E. Douglas ◽  
K. Suryanarayana Rao
Keyword(s):  
Excited States ◽  
Ground State ◽  
Singlet State ◽  
Band System ◽  
Excited Singlet State ◽  
Lower State ◽  
High Dispersion ◽  
Electron Configuration ◽  
Excited Singlet ◽  
New System

Five bands of a new band system of P2 have been photographed at high dispersion and analyzed. The upper state of the system is a 1П0 state and lies lower than any previously known excited singlet state. The lower state of the new system is the ground state of P2 and the analysis of the new bands has given improved constants for this state. The new system appears to be the analogue of the Lyman–Birge–Hopfield bands of N2. The electron configuration of the low excited states of P2 and of related molecules is discussed.

The electronic spectrum of F2

1976 ◽  
Vol 54 (13) ◽  
pp. 1343-1359 ◽  
Author(s):  
E. A. Colbourn ◽  
M. Dagenais ◽  
A. E. Douglas ◽  
J. W. Raymonda
Keyword(s):  
Absorption Spectrum ◽  
Ground State ◽  
Band System ◽  
Rydberg States ◽  
Rotational Analysis ◽  
Interaction Energies ◽  
Rydberg Series ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Ionic States

The absorption spectrum of F2 in the 780–1020 Å range has been photographed at sufficient resolution to allow a rotational analysis of many bands. A large number of vibrational levels of three ionic states have been observed and their rotational constants determined. Many perturbations in the rotational structure caused by the interaction between the three states have been investigated and the interaction energies determined. The rotational and vibrational structures of a few Rydberg states have also been analyzed in detail but no Rydberg series have been identified. The difficulties in assigning the observed states are discussed. A 1Σu+ – X1Σg+ emission band system has been observed in the 1100 Å region. An analysis of the bands of this system has allowed us to determine the term values and rotational constants of all the vibrational levels of the ground state with ν ≤ 22. The dissociation energy, D0(F2), is found to be greater than 12 830 and is estimated to be 12 920 ± 50 cm−1.

SPECTRUM AND STRUCTURE OF THE FREE HNCN RADICAL

1963 ◽  
Vol 41 (2) ◽  
pp. 286-298 ◽  
Author(s):  
G. Herzberg ◽  
P. A. Warsop
Keyword(s):  
Fine Structure ◽  
Ground State ◽  
Electronic Transition ◽  
Flash Photolysis ◽  
Geometrical Structure ◽  
Transition Moment ◽  
Lower State ◽  
State Formula ◽  
Exact Position

A widely spaced perpendicular band at 3440 Å observed in the flash photolysis of diazomethane is ascribed to the free HNCN radical. The study of the fine structure of this band for HNCN, DNCN, and HNC13N has yielded information about the geometrical structure of the molecule in both the upper and lower (ground) state. For the lower state[Formula: see text]The N—C—N group is very nearly linear, but the exact position of the C atom on this line could not be determined. The electronic transition is of the type 2A′–2A″, the transition moment being perpendicular to the plane of the molecule.

Rotational analysis of the A 0 u + , B 0 u + — X 0 g + systems of gaseous Te 2

1972 ◽  
Vol 327 (1569) ◽  
pp. 279-287 ◽  
Keyword(s):  
Wavelength Region ◽  
Lower State ◽  
Rotational Analysis ◽  
Absorption Bands ◽  
Small Perturbations ◽  
Vibrational Levels

A detailed rotational analysis has been made of 114 absorption bands of the main systems of 128 Te 2 and 130 Te 2 in the wavelength region 385.5 to 523.5 nm (3855 to 5235 Å). In addition eight emission bands of 128 Te 2 between 617 and 634 nm (6170 and 6340 Å) have been analysed. Only one lower state, the 0 g + component of 3 ∑ g – , has been recognized, but the bands involve two upper states, B 0 u + , which has been known for many years, and a new lower lying state of the same character, A 0 u + . The vibrational numbering in both transitions has been established. The levels in B 0 u + are subject to numerous small perturbations and to a large homogeneous perturbation for v ≽ 20. The vibrational levels in A 0 u + extrapolate smoothly to a limit at about 25920 cm -1 above v " = 0. If the products at this limit are Te( 3 P 2 ) + Te( 3 P 0 ), D 0 0 = 21210 cm -1 (2.63 eV). Other constants (cm -1 , for 130 Te 2 ) are as follows: state T e ω e x e ω e 10 3 y e ω e 10 2 B e 10 4 α e r e /nm r e /Å B 0 u + 22207.4 162.3 0.45 –11.09 3.254 1.25 0.2824 2.824 A 0 u + 19450.8 143.6 0.45 –3.892 3.124 1.30 0.2882 2.882 X 0 g + 0 247.07 0.515 –0.55 3.968 1.06 0.25774 2.5774

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