Fourier transform spectroscopy of the Herzberg I bands of O2

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1101-1108 ◽  
Author(s):  
K. Yoshino ◽  
J. E. Murray ◽  
J. R. Esmond ◽  
Y. Sun ◽  
W. H. Parkinson ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Wavelength Region ◽  
Rotational Line ◽  
Molecular Constants ◽  
Absorption Bands ◽  
Weakly Bound ◽  
Vibrational Levels ◽  
J 13 ◽  
Line Positions ◽  
Made In

Fourier transform spectroscopic measurements of the absorption bands of the Herzberg I system [Formula: see text] of O2, have been made in the wavelength region 240–270 nm. Rotational line positions are determined with an accuracy of 0.005 cm−1, and rotational term values are presented for the vibrational levels, ν = 4–11. Molecular constants of these levels are also presented. Interactions with the [Formula: see text] state are observed at J = 13 of the ν = 4 level, at J = 16 of the ν = 7 level, and at J = 15 and 24 of the ν = 9 level of the [Formula: see text] state. Another interaction around J = 10 of the ν = 11 level might result from the weakly bound 3Πu state.

Born–Oppenheimer breakdown in the ground state of carbon monoxide: A direct reduction of spectroscopic line positions to analytical radial Hamiltonian operators

1992 ◽  
Vol 70 (1) ◽  
pp. 40-54 ◽  
Author(s):  
John A. Coxon ◽  
Photos G. Hajigeorgiou
Keyword(s):  
Carbon Monoxide ◽  
Ground State ◽  
Direct Reduction ◽  
Direct Determination ◽  
Quantum Mechanical ◽  
Rotational Line ◽  
Molecular Constants ◽  
Full Account ◽  
Radial Wave ◽  
Line Positions

A collection of 10 866 of the most precise ground-state (X1Σ+) vibration–rotational and pure rotational line positions of four carbon monoxide isptopomers (12C16O, 12C18O, 13C16O, and 13C18O) is employed simultaneously in a direct determination of the radial Hamiltonian operator in compact analytical form. The 22-parameter isotopically self-consistent operator takes full account of the Born–Oppenheimer breakdown and its quantum-mechanical eigenvalues represent all the available spectroscopic line positions of CO isotopomers to within the experimental uncertainties. Rayleigh–Schrödinger perturbation theory is employed to calculate quantum-mechanical molecular constants of rotation (Bν – Mν) for nine common isotopomeric forms of CO. Together with the quantum-mechanical vibrational eigenvalues these are fully consistent with the exact eigenvalues obtained by direct solution of the radial wave equation. The set of constants is expected to provide an accurate prediction of line positions of CO isotopomers that have not yet been experimentally observed.

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

Vibration-rotation bands and molecular constants of carbonyl sulphide

1954 ◽  
Vol 222 (1151) ◽  
pp. 431-443 ◽  
Keyword(s):  
Fermi Resonance ◽  
Resolving Power ◽  
Molecular Constants ◽  
Absorption Bands ◽  
Coriolis Interaction ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Vibration Rotation ◽  
Carbonyl Sulphide ◽  
First Time

The vibrational absorption bands of carbonyl sulphide 12 C 16 O 33 S near 5 μ have been examined using very high resolving power. Rotational fine structure has been resolved for the first time; six bands have been studied, including two associated with the isotopic species 13 C 16 O 33 S, and a rotational analysis of each has been carried out. Values have been derived for the rotational constants B and D in the different vibrational levels, and these have been compared with the results obtained from the microwave spectrum for the lower states. It has been found that the location of certain bands, and the rotational constants B are affected by Fermi resonance and Coriolis interaction, and estimates of the unperturbed values have been made.

Molecular constants of 128Te2

1991 ◽  
Vol 69 (1) ◽  
pp. 57-61 ◽  
Author(s):  
O. Babaky ◽  
K. Hussein
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
High Precision ◽  
Fluorescence Spectra ◽  
Fourier Transform Spectroscopy ◽  
Molecular Constants ◽  
Vibrational Levels ◽  
Potential Curves

Laser-excited fluorescence spectra of 128Te2 were studied by high-resolution Fourier transform spectroscopy, the sources of excitation used were Ar+ and Kr+ laser lines at 5145, 4880, 4579, and 4131 Å. (1 Å = 10−10 m). Transitions involving three upper states, [Formula: see text] and [Formula: see text] and three lower states [Formula: see text] and [Formula: see text] have been identified. The molecular constants of the lower states were determined with high precision. These constants were used to obtain the Rydberg–Klein–Rees potential curves of the states for vibrational levels ν up to 42. Limited results were also obtained for the upper states [Formula: see text] and [Formula: see text]

The ground state of Na2

1989 ◽  
Vol 67 (9) ◽  
pp. 912-918 ◽  
Author(s):  
O. Babaky ◽  
K. Hussein
Keyword(s):  
Fourier Transform ◽  
Gas Phase ◽  
Ground State ◽  
Laser Induced Fluorescence ◽  
Rotational Relaxation ◽  
Fixed Frequency ◽  
Molecular Constants ◽  
Vibrational Levels ◽  
Laser Frequencies ◽  
Ion Laser

The laser-induced fluorescence of the [Formula: see text] and [Formula: see text] transitions of Na2 are analysed, using high resolution Fourier transform spectroscopy. Fixed-frequency ion-laser lines (4880 and 4765 Å (1 Å = 10−10 m) from Ar+ and 6471 and 4762 Å from Kr+) together with laser frequencies from a ring dye laser, using rhodamine 6 G with λ = 5781.22 and 5796.80 Å, were used to excite Na dimer in the gas phase. Twenty-eight series of [Formula: see text] and [Formula: see text] systems have been assigned and analysed, and the strong transitions are accompanied by numerous rotational relaxation lines. Molecular constants of the [Formula: see text] state were calculated with high precision from simultaneous least-squares fits to 1410 lines assigned to the A–X and B–X systems. These constants have been used to determine the Rydberg–Klein–Rees potential curve of the X ground state for vibrational levels up to ν = 62.

scholarly journals VLBA observations of the 7mm SiO masers in TX Cam and R Cas

2002 ◽  
Vol 206 ◽  
pp. 274-277 ◽  
Author(s):  
Jiyune Yi ◽  
Roy S. Booth ◽  
John E. Conway ◽  
Anders Winnberg ◽  
Phillip J. Diamond
Keyword(s):  
High Resolution ◽  
Rotational Line ◽  
Circumstellar Envelopes ◽  
Evolved Stars ◽  
Long Baseline ◽  
Mira Variables ◽  
Vlbi Observations ◽  
Vibrational Levels ◽  
Very Long Baseline Array ◽  
Made In

Simultaneous VLBI observations of the SiO masers of the J = 1 → 0 rotational line in the v = 1 and v = 2 vibrational levels toward Mira variables are presented. Because SiO maser lines are formed deep in circumstellar envelopes they serve as a unique tool to study the innermost envelopes of evolved stars. Although the first interpretation of SiO maser emission was made in 1974, observational features are only partially explained by models which have been suggested since then. Positional coincidence of the J = 1 → 0 masers of v = 1 and v = 2 has been argued as a way to distinguish among the maser pumping models, but it requires simultaneous observations of the two lines using high resolution. We have developed the technique for such observations during the last few years and here we report successful results of our simultaneous observations of the SiO v = 1 and v = 2 J = 1 → 0 masers using the Very Long Baseline Array (VLBA). We discuss the pumping mechanism in terms of our observational results.

The temperature dependence of the 8920 Å band of NO2 and the location of the 000–000 band of the transition

1978 ◽  
Vol 56 (7) ◽  
pp. 838-845 ◽  
Author(s):  
A. J. Merer ◽  
K-E. J. Hallin
Keyword(s):  
Wavelength Region ◽  
High Dispersion ◽  
Absorption Bands ◽  
Temperature Spectrum ◽  
Vibrational Levels ◽  
Room Temperature Spectrum ◽  
Band Absorption ◽  
Hot Band ◽  
Franck Condon ◽  
Good Agreement

The absorption spectrum of NO2 cooled to −30 °C has been photographed at high dispersion in the wavelength region 8200–9100 Å. Comparison with the room temperature spectrum shows that weak absorption from the ground state of the molecule underlies slightly stronger 'hot' band absorption at 8920 Å. Franck–Condon calculations based on the relative intensities of absorption bands from the 000 and 010 vibrational levels of the molecule indicate that the 000–000 band of the [Formula: see text] electronic transition lies near 10250 Å (1.21 eV) with a possible uncertainty of one quantum of ν2′ (0.09 eV). This result is in good agreement with the multiconfiguration SCF calculations of Gillispie and Khan (which are at variance with previous experimental deductions on the location of the 000–000 band).Some new assignments have been made in the rotational structure of the 8360 Å band.

Global fitting of the vibrational-rotational line positions of the acetylene molecule

2000 ◽  
Author(s):  
Oleg M. Lyulin ◽  
Valery I. Perevalov ◽  
Sergey A. Tashkun ◽  
Jean-Luc Teffo
Keyword(s):  
Rotational Line ◽  
Acetylene Molecule ◽  
Line Positions ◽  
Global Fitting

scholarly journals On the Coronal and Prominence Structures Observed at the Total Solar Eclipse of 11 July 1991

1994 ◽  
Vol 154 ◽  
pp. 205-210
Author(s):  
Y. Suematsu ◽  
H. Fukushima ◽  
Y. Nishino
Keyword(s):  
Solar Eclipse ◽  
Near Infrared ◽  
Thermal Structure ◽  
Wavelength Region ◽  
Total Solar Eclipse ◽  
Preliminary Results ◽  
Spectroscopic Observations ◽  
Physical Conditions ◽  
Made In

Coronal images were taken in the light of the He I 10830 Å line, the 10000 Å continuum, and the Fe XIV 5303 Å line, with the aim of studying the thermal structure of the corona. In addition, spectroscopic observations were made in the violet wavelength region (3760-4060 Å) and near-infrared (10745-10835 Å), to obtain details of physical conditions of the corona, especially of its cool part. The data obtained do not show any distinct cool structures other than ordinary prominences. Some preliminary results concerning the corona and prominence structures are given.

Vibration-rotation bands and rotational constants of dideuteroacetylene

1955 ◽  
Vol 232 (1190) ◽  
pp. 291-309 ◽  
Keyword(s):  
Resolving Power ◽  
Vibrational States ◽  
Absorption Bands ◽  
Rotational Constants ◽  
Vibrational Assignments ◽  
Vibrational Anharmonicity ◽  
A Value ◽  
Vibrational Levels ◽  
Vibration Rotation ◽  
Very High

Nine vibrational absorption bands of dideutero-acetylene have been examined with very high resolving power. The rotational constants have been determined for the vibrational levels concerned, and the coefficients α i have been determined with more convincing accuracy than previously. In some of the bands the Q branches have been resolved, so that the l -doubling coefficients q i could be derived, and details could be established about the doublet components in some II levels. The results emphasize the need of high resolution if the vibrational assignments are to be unambiguous, and if reliable values of the rotational constants are to be derived. A value of B e has been obtained, and the vibrational anharmonicity coefficients have been considered briefly. Estimates of the centrifugal stretching constants D i in different vibrational states have been made, and one anomalous case has been found.

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