Abstract

This letter reports the first photo-detachment spectrum of the hydrogen anion, H2−. The spectrum was recorded over the range of excitation energies Ehν=17600–17750cm−1, at known laser fluence and under non-saturation conditions. This permitted us to extract absolute values for the photo-depletion cross-section which varies in the range 1–6×10−18cm2 and exhibits oscillatory behaviour. This interesting behaviour was attributed to an electro-dynamical interaction between of the highly-rotating hydrogen daughter molecule and the detached electron. The presence of such oscillations may open new ways to investigate exotic anions relevant to molecular astrophysics and plasma physics.

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