Observation of a striking departure from velocity proportionality in low-energy electronic stopping
By time-of-flight spectrometry we have measured the energy loss of hydrogen projectiles in helium gas. We show that for projectile velocities {ital v}{sub 1} below the Bohr velocity the presence of an appreciable minimum excitation energy leads to a significant deviation of the electronic stopping c...
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Veröffentlicht in: | Physical review letters 1991-04, Vol.66 (14), p.1831-1833 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | By time-of-flight spectrometry we have measured the energy loss of hydrogen projectiles in helium gas. We show that for projectile velocities {ital v}{sub 1} below the Bohr velocity the presence of an appreciable minimum excitation energy leads to a significant deviation of the electronic stopping cross section from the {ital v}{sub 1} proportionality generally assumed; at 4 keV a dependence on roughly the third power of {ital v}{sub 1} is found. |
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ISSN: | 0031-9007 1079-7114 |
DOI: | 10.1103/physrevlett.66.1831 |