Momentum imaging spectrometer for molecular fragmentation dynamics induced by pulsed electron beam
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)
A momentum imaging spectrometer has been built for studying the electron impact molecular fragmentation dynamics. The setup consists of a pulsed electron gun and a time of flight system as well as a two-dimensional time and position sensitive multi-hit detector. The charged fragments with kinetic energy up to 10 eV can be detected in 4π solid angles and their three-dimensional momentum vectors can be reconstructed. The apparatus is tested by electron impact ionization of Ar and dissociative ionization of CO{sub 2}. By analyzing the ion-ion coincidence spectra, the complete and incomplete Coulomb fragmentation channels for CO{sub 2}{sup 2+} and CO{sub 2}{sup 3+} are identified. The kinetic energy release (KER) and angular correlation for the two-body breakup channel CO{sub 2}{sup 2+*}→ O{sup +}+ CO{sup +} are reported. The peak value of total KER is found to be 6.8 eV which is consistent with the previous photoion-photoion coincidence studies, and the correlation angle of O{sup +} and CO{sup +} is also explicitly determined to be 172.5°.
- OSTI ID:
- 22220212
- Journal Information:
- Review of Scientific Instruments, Vol. 84, Issue 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR CORRELATION
ARGON
BERYLLIUM 6
CARBON DIOXIDE
CARBON MONOXIDE
COINCIDENCE SPECTROMETRY
ELECTRON BEAMS
ELECTRONS
EV RANGE
FRAGMENTATION
IONIZATION
KINETIC ENERGY
OXYGEN IONS
POSITION SENSITIVE DETECTORS
PULSES
TIME-OF-FLIGHT SPECTROMETERS