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End Stations for Gas Phase Studies |
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Multiplex Coincidence Apparatus for Chemical Dynamics and Spectroscopy
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Research areas
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A picture of the core section
of the endstation
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A 3-D drawing of the full endstation
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Gas phase photofragmentation dynamics, photoionization, Auger and Coster-Kronig
decay
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Research interests
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Energetics and decay paths of multiply ionized and highly excited molecules and
intricate details of their dissociation dynamics and potential energy surfaces,
with an eye to their potential application in controlled reactions driven by
designer laser pulses.
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Selective bond breakage with core-electron excitation
Dynamics of photoionization, and Auger and Coster-Kronig electron emission, as
probed by anisotropy of ejected electrons.
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Measuring techniques
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Electron-ion coincidence with ion imaging, electron-electron coincidence, XPS,
AES, XANES, ZEKE electron spectroscopy. |
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Capabilities
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Momentum coincidence between fragment ions aimed at revelation of the minutiae
of dissociation dynamics and the topography of the potential energy surfaces.
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Rotation of the whole apparatus with respect to the light axis without breaking
vacuum; facility for magic angle, pseudo-magic angle, pan-magic angle, and
anisotropy measurements.
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Ion optics capable of high mass and momentum resolution, and 4π
steradian collection of ions up to 20 eV intrinsic kinetic energy, under low
extraction fields suitable for coincidence measurement.
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Equipment list
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Hemispherical energy analyzer (PHI, OmniV lens, 16 channel detector)
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Time-of-flight spectrometer (1 meter, real-time 2D
position-sensitive detector)
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ZEKE electron detector
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CAMAC modules:
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TDC, G&D generator, discriminator/latch, counter, D/A converter, timing
pulse generator, crate controller, PC interface card
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NIM modules:
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TAC, differential amplifier, constant fraction discriminator, linear/logic
fanout, discriminator, level translator, counter/timer, ratemeter, V/F
converter
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Personal computers, power supplies, digitizing oscilloscope (Tektronix TDS
744A)
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Pumps :
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Magnetically levitated turbomolecular pumps, scroll pumps, rotary vane pump |
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