Forrey RC, Cote R, Dalgarno A, Jonsell S, Saenz A, Froelich P
Penn State University, Berks-Lehigh Valley College, Reading, Pennsylvania 19610-6009 and Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2000 Nov 13;85(20):4245-8. doi: 10.1103/PhysRevLett.85.4245.
The complex interaction potentials arising in the approach of two metastable hydrogen 2s atoms are calculated and the cross sections for ionization, excitation transfer, and elastic scattering are predicted. The measured cross section for associative ionization at E = 4.1 meV equals 2x10(-15) cm (2). We calculate a total ionization cross section of 2x10(-13) cm (2), varying as E(-2/3) at higher energies. Thus it appears that dissociative ionization is the major ionization channel. We find also that double excitation transfer into two excited H(2p) atoms is still more probable with the large cross section of 9x10(-12) cm (2) at E = 4.1 meV varying as E(-1/2) at higher energies. The detection of the resulting Lyman alpha photons would provide a diagnostic test of our predictions.
计算了两个亚稳态氢2s原子接近时产生的复杂相互作用势，并预测了电离、激发转移和弹性散射的截面。在E = 4.1 meV时测量的缔合电离截面等于2×10^(-15) cm²。我们计算出总电离截面为2×10^(-13) cm²，在较高能量下随E^(-2/3)变化。因此，似乎离解电离是主要的电离通道。我们还发现，在E = 4.1 meV时，双激发转移到两个激发的H(2p)原子仍然更有可能，其大截面为9×10^(-12) cm²，在较高能量下随E^(-1/2)变化。对产生的莱曼α光子的探测将为我们的预测提供诊断检验。
