EDP Sciences
Free access
Volume 437, Number 3, July III 2005
Page(s) 1023 - 1027
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20052694

A&A 437, 1023-1027 (2005)
DOI: 10.1051/0004-6361:20052694

Processes of (n - n')-mixing in collisions of Rydberg H $\mathsfsl{^{*}}$(n) atoms with H(1s) in the Solar atmosphere

A. A. Mihajlov1, 2, Lj. M. Ignjatovic1, 2 and M. S. Dimitrijevic2, 3

1  Institute of Physics, PO Box 57, 11001 Belgrade, Serbia and Montenegro
    e-mail: mihajlov@phy.bg.ac.yu
2  Institute Isaac Newton of Chile, Yugoslavia Branch, and Universidad Diego Portales, Chile
3  Astronomical Observatory, Volgina 7, 11160 Belgrade 74, Serbia and Montenegro

(Received 13 January 2005 / Accepted 17 March 2005)

The significance of (n-n')-mixing processes in H*(n)+H(1s) collisions, for the principal quantum number $n \ge
4$, in the Solar photosphere and lower chromosphere has been investigated. These processes have been treated by the mechanism of resonant energy exchange within the electron component of the considered collision system. These processes must have significant influence in comparison with corresponding electron-atom collision processes on the populations of hydrogen Rydberg atoms in weakly ionized layers of the Solar atmosphere (ionization degree of the order of 10-4). From the results obtained it follows that the examined (n-n')-mixing processes have to be included in any modelling and investigation of Solar plasma, especially in the region of the temperature minimum in the Solar photosphere.

Key words: atomic processes -- molecular processes -- Sun: atmosphere

© ESO 2005