Production of neutral particles following O 1s excitation of HO; H yield and kinetic energy, and ion-H coincidence studies

Harries, J.; Iseda, Mitsuhiro*; Kuniwake, Miki*; Homma, Kenji*; Gejo, Tatsuo*; Sullivan, J. P.*; Azuma, Yoshiro*

We report here on studies where metastable H atoms and VUV photons are detected following the O 1s excitation of HO. The studies reveal new information not accessible with ion or electron techniques. The studies are performed using pulsed soft X-ray synchrotron radiation at SPring-8's BL27SU. Metastable particles and VUV photons are directly detected using 2 MCP detectors, and the arrival times of the particles are recorded relative both to each other and to the pulses of incoming radiation. The technique allows the separation of VUV and metastable particle yield, and the study of fluorescence lifetimes. The time-resolved detection of Lyman- radiation allows the determination of the population distribution of excited H atoms.