Abstract
We present experimental and theoretical differential cross sections for the fine structure changing process Ar + O(3P2)→Ar + O(3Pjmj) with (j,mj)=(1,1), (1,0), and (0,0). The measured cross sections refer to a collision energy of 3.2 kcal/mol, and were obtained from Doppler line shapes associated with (2+1) resonance-enhanced multiphoton ionization of O(3Pjmj) after scattering in a crossed-beam apparatus. The theoretical results are based on 3Σ- and 3Π potential curves obtained from high quality ab initia calculations, and on quantum coupled-channel calculations. The calculated differential cross sections show strong Stuckelberg oscillations, with similar magnitudes and phases for all three final states. With slight adjustment (0.03 Å) of the hard wall on the 3Σ- curve, the calculated angular distributions match up well with the corresponding experimental results, much better than is found using previously derived empirical potentials. At the same time, the integral total cross sections obtained from the ab initia measurements are in satisfactory agreement with previous measurements.
| Original language | English |
|---|---|
| Pages (from-to) | 8026-8039 |
| Number of pages | 14 |
| Journal | Journal of Chemical Physics |
| Volume | 100 |
| Issue number | 11 |
| Publication status | Published - 1994 |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Differential cross sections for fine structure transitions in O( 3P2)+Ar Collisions. / Ma, Z.; Liu, K.; Harding, L. B.; Komotos, M.; Schatz, George C.
In: Journal of Chemical Physics, Vol. 100, No. 11, 1994, p. 8026-8039.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Differential cross sections for fine structure transitions in O( 3P2)+Ar Collisions
AU - Ma, Z.
AU - Liu, K.
AU - Harding, L. B.
AU - Komotos, M.
AU - Schatz, George C
PY - 1994
Y1 - 1994
N2 - We present experimental and theoretical differential cross sections for the fine structure changing process Ar + O(3P2)→Ar + O(3Pjmj) with (j,mj)=(1,1), (1,0), and (0,0). The measured cross sections refer to a collision energy of 3.2 kcal/mol, and were obtained from Doppler line shapes associated with (2+1) resonance-enhanced multiphoton ionization of O(3Pjmj) after scattering in a crossed-beam apparatus. The theoretical results are based on 3Σ- and 3Π potential curves obtained from high quality ab initia calculations, and on quantum coupled-channel calculations. The calculated differential cross sections show strong Stuckelberg oscillations, with similar magnitudes and phases for all three final states. With slight adjustment (0.03 Å) of the hard wall on the 3Σ- curve, the calculated angular distributions match up well with the corresponding experimental results, much better than is found using previously derived empirical potentials. At the same time, the integral total cross sections obtained from the ab initia measurements are in satisfactory agreement with previous measurements.
AB - We present experimental and theoretical differential cross sections for the fine structure changing process Ar + O(3P2)→Ar + O(3Pjmj) with (j,mj)=(1,1), (1,0), and (0,0). The measured cross sections refer to a collision energy of 3.2 kcal/mol, and were obtained from Doppler line shapes associated with (2+1) resonance-enhanced multiphoton ionization of O(3Pjmj) after scattering in a crossed-beam apparatus. The theoretical results are based on 3Σ- and 3Π potential curves obtained from high quality ab initia calculations, and on quantum coupled-channel calculations. The calculated differential cross sections show strong Stuckelberg oscillations, with similar magnitudes and phases for all three final states. With slight adjustment (0.03 Å) of the hard wall on the 3Σ- curve, the calculated angular distributions match up well with the corresponding experimental results, much better than is found using previously derived empirical potentials. At the same time, the integral total cross sections obtained from the ab initia measurements are in satisfactory agreement with previous measurements.
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M3 - Article
VL - 100
SP - 8026
EP - 8039
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 11
ER -