Energy Loss Measurement in Collisions of H^+ and D^+ Ions with Alkali Metals Using Charge Inversion Mass Spectrometry

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概要

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• Charge inversion mass spectrometry measures negative ions formed both by double-electron-transfers in one collision and by successive single-electron-transfers in two collisions. Mechanism for H- ion formation in collisions of H+ ions with alkali metals has been studied by developing calibration methods of translational energy losses along with measurements of target density dependences in the charge inversion mass spectrometry. Two peaks with different translational energies were observed in magnified spectra of the peak associated with H- ions with Cs and K targets. One of the two peaks with the higher translational energy had higher intensity and showed a quadratic dependence on target density, while the other with the lower translational energy had lower intensity and showed a linear dependence on the target density. The translational energy difference was calibrated both by monitoring the magnetic flux density and by changing the accelerating voltage. The translational energy differences between the two peaks were evaluated as 10.7±0.4 eV and 17.4±0.5 eV with Cs and K targets, respectively. The translational energy differences of H- ions coincided with those of D- ions for both Cs and K targets. For Na target, only one peak with the quadratic dependence on the target density was observed. From the energy difference and the linear dependence on target density, the peak with the lower translational energy was ascribed to double electron transfer forming H-(1s2) ions in one collision. Existence of a double electron transfer process forming H-(1s2) and excited Cs2+(5s, 5p5) was suggested for a weak peak with the energy loss of about 34 eV with Cs target. The peak with the higher translational energy and the quadratic dependence was ascribed to three-step process which was composed of neutralization forming H(2p), spontaneous Ly-α emission from H(2p) and anionization forming H-(1s2) ions from H(1s).

• 1995-10-30

著者

• Kadomura K.

  College Of Integrated Arts And Sciences University Of Osaka Prefecture

• HAYAKAWA S.

  College of Integrated Arts and Sciences, University of Osaka Prefecture

• FUJII K.

  College of Integrated Arts and Sciences, University of Osaka Prefecture

関連論文

• Energy Loss Measurement in Collisions of H^+ and D^+ Ions with Alkali Metals Using Charge Inversion Mass Spectrometry

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