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Report No.
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Energy spectra of electrons induced by MeV atom clusters

Kudo, Hiroshi*; Iwasaki, Wataru*; Uchiyama, Rumi*; Tomita, Shigeo*; Shima, Kunihiro*; Sasa, Kimikazu*; Ishii, Satoshi*; Narumi, Kazumasa; Naramoto, Hiroshi; Saito, Yuichi; Yamamoto, Shunya; Kaneko, Toshiaki*

The first observation of the energy distribution of electrons emitted from solids bombarded by MeV atom clusters is reported. In the backward direction, using graphite and Si bombarded by C$$_{n}$$$$^{+}$$ and Al$$_{n}$$$$^{+}$$ (n $$leq$$ 8), an appreciable suppression of electron emission has been observed at electron energies lower than $$sim$$10 eV. Electron yield per atom decreases with increasing n, and becomes less than 50% at n $$geq$$ 3, relative to the case of n = 1. The experimental results cannot be explained in terms of projectile stopping cross sections nor by the clearing-the-way effect. It is probable that the suppressed electron emission is a result of the suppression of the transport or surface transmission of the produced low-energy electrons, rather than of the suppression of ionization.

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Category:Physics, Applied

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