The de-excitation cross sections of H(3l) atoms colliding with molecular hydrogen (T = 300 K) were determined in the velocity range of 2-7 km s −1 . At a mean velocity of 5 km s −1 the de-excitation cross sections are σ 3s = 170 ± 7 Å2 , σ 3d = 129 ± 7 Å2 andThe velocity dependence of the de-excitation cross sections observed in the experiment agrees with the H 2 quadrupole-H dipole interaction and with the quantum character of the molecular rotation.
The polarization anisotropy of Lyman-α fluorescence in the photodissociation of the doubly excited states of H2 has been measured in the 27–38 eV energy range. It has been calculated taking into account the dissociation probabilities of the various molecular states involved in the process and the depolarization due to collisional effects. The agreement between experiment and theory is very good; it shows the importance of interferences and gives confidence in the analysis of the process. The fluorescence polarization anisotropy has been calculated classically in the case of a dissociation leading to H(2pπ) + H(2pσ) excited fragments.
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