Spectroscopy and perturbation analysis of the A1π (v=0) state of13C16O (original) (raw)
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Molecular Physics
The A 1 (v = 0) level of 12 C 18 O has been reinvestigated using three different high-resolution spectroscopic methods: (1) 2 + 1 resonance-enhanced multiphoton ionisation of the A 1 − X 1 + (0, 0) band using narrowband lasers in a Doppler-free geometry; (2) Fourier-transform emission spectroscopy in the visible range probing the B 1 + − A 1 (0, 0) band in a discharge; (3) Fourier-transform absorption spectroscopy in the vacuum-ultraviolet range measuring the A 1 − X 1 + (0, 0) and B 1 + − X 1 + (0, 0) bands at multiple temperatures ranging from 90 to 900 K. An effective-Hamiltonian analysis of A 1 , v = 0 levels was performed up to J = 44 which quantitatively addresses perturbations by the e 3 − (v = 1), d 3 (v = 4), a 3 + (v = 9), D 1 (v = 0), and I 1 − (v = 0, 1) levels.
Reanalysis of the Ångström System ( B 1 Σ + − A 1 Π ) in the 13 C 16 O Isotopic Molecule
2012
The emission spectrum of the Ångström system (BΣ−AΠ ) of CO was obtained under high resolution with an accuracy estimated to be ±0.002 cm−1 as an emission spectrum using a high accuracy dispersive optical spectroscopy. The light source was a hollow-cathode lamp with two anodes built in our laboratory, with a previously deposited small quantity of C carbon on the electrodes. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. In total 195 transition wave numbers belonging to the strongest 0 1 and 0 2 bands of the B−A system were precisely measured. The modern rotational reanalysis made it possible to verify the molecular information for the both combining states of the Ångström system. In particular the rovibrational constants for the BΣ Rydberg state have been signi cantly improved (B0 = 1.8625054(65) cm−1 and D0 = 6.1384(52) × 10−6 cm−1) and the obtained equilibrium rotational constants of this state are more accura...
The Journal of Chemical Physics, 2005
Two new red-degraded bands in the room-temperature vacuum-ultraviolet absorption spectrum of carbon monoxide have been identified in the 94 000-94 500 cm −1 energy region and analyzed. One of the bands at Ϸ94 225 cm −1 ͑106.1 nm͒ has three observable bandheads and is partially overlapped with the strong C 1 ⌺ +-X 1 ⌺ + ͑1-0͒ transition at lower energy. It is assigned to the c 3 ⌸-X 1 ⌺ + ͑1-0͒ transition. The other band at Ϸ94 437 cm −1 ͑105.9 nm͒ with one clear bandhead is assigned to the k 3 ⌸-X 1 ⌺ + ͑5-0͒ transition. A strong homogeneous perturbation was found to exist between the two upper states that strongly influences the line positions and shapes of these bands. A rotational deperturbation analysis was performed and molecular rotational constants for both upper states were determined. These deperturbed molecular constants are entirely consistent with the expected values for the k 3 ⌸ valence and c 3 ⌸ Rydberg states. The Hamiltonian interaction term between these two states is found to be separable into vibrational and electronic factors and the electronic factor is determined to be H e = 323± 40 cm −1. A discrepancy in the literature regarding the location of the c 3 ⌸ ͑v =1͒ state is identified and discussed.
Fourier-transform spectroscopy of 13C17O and deperturbation analysis of the A1Π (υ=0–3) levels
Journal of Quantitative Spectroscopy and Radiative Transfer
The high-resolution B 1 Σ + → A 1 Π (0, 0) and (0, 3) emission bands of the less-abundant 13 C 17 O isotopologue have been investigated by Fourier-transform spectroscopy in the visible region using a Bruker IFS 125HR spectrometer at an accuracy 0.003 cm-1. These spectra are combined with highresolution photoabsorption measurements of the 13 C
High resolution study of Q-branches in the E1Π–X1Σ+ (0,0) band of 12C16O, 13C16O, and 13C18O
Journal of Molecular Spectroscopy, 2004
A tunable and narrowband vacuum ultraviolet laser system near k ¼ 107:5 nm is used to record Doppler-free molecular beam spectra of the E 1 P-X 1 R þ (0; 0) band for three isotopomers of carbon monoxide. The Q branches of the E-X (0; 0) bands in 12 C 16 O, 13 C 16 O, and 13 C 18 O are fully resolved in this study, performed at a resolution of 0.02 cm À1 (FWHM). The newly obtained data are included in a comprehensive fitting routine with previous data to yield optimized molecular constants for the upper level.
High resolution spectroscopy and perturbation analysis of the CO A1Π −X1Σ+ (0,0) and (1,0) bands
Molecular Physics, 2013
The two lowest-v (0,0) and (1,0) bands of the A 1 −X 1 + system of 12 C 16 O have been investigated by two high-resolution spectroscopic methods. A vacuum ultraviolet Fourier-transform spectrometer, illuminated by synchrotron radiation, was applied to record a jet-cooled spectrum and a room temperature static gas spectrum, resulting in absolute accuracies of 0.01−0.02 cm −1. In addition two-photon Doppler-free laser spectroscopy has been applied to a limited number of rotational lines, resulting in an accuracy of 0.002 cm −1. The data were used to perform an improved analysis of the perturbations in the A 1 , v = 0 and v = 1 levels by vibrational levels in the D 1 , I 1 − , e 3 − , d 3. and a 3 + states.
Laser Spectroscopic Studies of the C1S/, £ Å 0 and £ Å 1 States of CO
Two laser spectroscopic investigations were performed on the C 1 S / -X 1 S / (1,0) and (0,0) bands of CO. In the first experiment, using 2 / 1 resonance-enhanced multiphoton ionization, information on highly excited rotational states up to J É 50 was obtained. In the second experiment, application of a narrow-band VUV laser provided highly accurate absolute calibrations. Molecular constants for 12 C 16 O, 13 C 16 O, 12 C 18 O, and, for the first time, 12 C 17 O are derived.