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Updated: May 24, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Laser measurement of H- ions in a field-effect-transistor based radio frequency ion source
N Tanaka1, T Matsuno, T Funaoi
1Tohoku University, Aramaki 6-6-05, Aoba, Sendai, Miyagi 980-8579, Japan. nozomi@ecei.tohoku.ac.jp
Abstract:
Hydrogen negative ion density measurements are required to clarify the characteristics of negative ion production and ion source performance. Both of laser photodetachment and cavity ring down (CRD) measurements have been implemented to a field-effect-transistor based radio-frequency ion source. The density ratio of negative hydrogen ions to electrons was successfully measured by laser photodetachment and effect of magnetic filter field on negative ion density was confirmed. The calculated CRD signal showed that CRD mirrors with >99.990% reflectivity are required and loss of reflectivity due to cesium contamination should be minimized.
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