Photoion rotational distributions from near‐threshold to deep in the continuum
| Autor: | Kwanghsi Wang, Sandeep Kakar, R. M. Rao, Erwin D. Poliakoff, A. G. Mihill, Vincent McKoy, Heung Cheun Choi |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 103:1773-1787 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.469751 |
| Popis: | We present the first measurements of ion rotational distributions for photoionization over an extended range [0 ≤ E_K ≤ 200 eV for N_2 (2σ^(−1)_u ) and 3 ≤ E_K ≤ 125 eV for CO (4σ^(−1))]. The N_2 ion rotational distributions are seen to change dramatically over this energy range, indicating that characteristically molecular behavior of the photoelectron persists far from ionization threshold. In addition, the N_2 and CO results show a strikingly different dependence on energy. Although differences are expected due to the absence of a center of symmetry in CO, detailed calculations reveal that this behavior arises from the presence of Cooper minima in the 2σ_u →kσ_g continuum in the case of N_2 and from an f‐wave shape resonance in the 4σ→kσ channel in CO. Agreement between measured and calculated ion rotational distributions is excellent. The N_2 results are also compared with electron bombardment ionization data. This comparison demonstrates that previous interpretations of electron bombardment data are prone to errors. |
| Databáze: | OpenAIRE |
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