Interference effects on the photoionization cross sections between two neighbouring atoms: nitrogen as an example |
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| Authors: | Wu Jian-Hua and Yuan Jian-Min |
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| Affiliation: | Department of Physics, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | Interference effects on the photoionization cross sectionsbetween two neighbouring atoms are considered based on the coherentscattering of the ionized electrons by the two nuclei when theirseparation is less than or comparable to the de Broglie wave lengthof the ionized electrons. As an example, the single atomic nitrogenionization cross section and the total cross sections of twonitrogen atoms with coherently added photoionization amplitudes arecalculated from the threshold to about 60~AA (1~AA=0.1~nm) of thephoton energy. The photoionization cross sections of atomic nitrogenare obtained by using the close-coupling R-matrix method. In thecalculation 19 states are included. The ionization energy of theatomic nitrogen and the photoionization cross sections agree wellwith the experimental results. Based on the R-matrix results ofatomic nitrogen, the interference effects between two neighbouringnitrogen atoms are obtained. It is shown that the interferenceeffects are considerable when electrons are ionized just above thethreshold, even for the separations between the two atoms are largerthan two times of the bond length of N2 molecules. Therefore, inhot and dense samples, effects caused by the coherent interferencebetween the neighbours are expected to be observable for the totalphotoionization cross sections. |
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| Keywords: | interference effect photoionization cross section nitrogen atom |
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