Electron-impact ionization of In[sup +] and Xe[sup +]
- Joint Institute for Laboratory Astrophysics, University of Colorado National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)
Absolute ionization cross sections for In[sup +] and Xe[sup +] by electron impact have been measured from below threshold to 200 eV using the crossed-beams technique. The cross sections for In[sup +] were possibly enhanced by indirect ionization processes. The excitation of the ion from the 4[ital d][sup 10]5[ital s][sup 2] ground state to the 4[ital d][sup 9]5[ital s][sup 2]5[ital p] state followed by autoionization has been postulated. The In[sup +] cross sections show a peak value of 15.9[times]10[sup [minus]17] cm[sup 2] at about 80 eV. The cross sections for Xe[sup +] peak at a value of 25.6[times]10[sup [minus]17] cm[sup 2] at about 35 eV. Experimental measurements are compared to configuration-averaged distorted-wave calculations [M. S. Pindzola [ital et] [ital al]., J. Phys. B 16, L355 (1983)], the semiempirical formula of Lotz [Z. Phys. 216, 241 (1968)], and, in the case of Xe[sup +], previous experimental results [C. Achenbach [ital et] [ital al]., J. Phys. B 17, 1405 (1984)]. Also presented are ionization-rate coefficients and fitting parameters for both ions for temperatures in the range 10[sup 4] K[le][ital T][le]10[sup 7] K.
- DOE Contract Number:
- AI05-86ER53237
- OSTI ID:
- 5573883
- Journal Information:
- Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:6; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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