State-to-State Spectroscopy and Chemistry by Vacuum Ultraviolet Laser Photoionization and Photoelectron Methods

Speaker: 
Cheuk-Yiu Ng, University of California, Davis
Event Date and Time: 
Fri, 2013-05-24 16:00 - 17:00
Location: 
Chem D-215
Local Contact: 
Ed Grant
Intended Audience: 
Graduate

Recent experimental progress in the application of single-photon vacuum ultraviolet (VUV) laser
and two-color infrared (IR)-VUV and VUV-VUV laser photoexcitation schemes for state-to-state
photoionization, photoelectron, photodissociation, and ion-molecule collision studies will be presented.1-5
By implementing a tunable VUV photoionization laser with a velocity-map-imaging (VMI) spectrometer, we
have been able to perform VMI-threshold photoelectron (VMI-TPE) measurements, achieving an energy
resolution comparable to that commonly observed in pulsed field ionization-photoelectron (PFI-PE)
measurements. A newly developed VUV-VUV laser pump-probe VMI-photoion (VMI-PI) apparatus
designed for state-to-state VUV photo-dissociation studies will be described. This apparatus consists of two
independently tunable VUV lasers and thus allows state-selective photodissociation by the VUV
photoexcitation laser and state-selective detection by the VUV photoionization laser. A novel VUV laser
PFI-PI ion source has also been successfully developed for the preparation of rovibrationally selected PFI-PI
ions for bimolecular collisional studies. By combining this novel VUV laser PFI-PI ion source with a guided
ion beam mass spectrometer, we have been able to examine the kinetic, vibrational, rotational energy effects
on chemical reactivity of molecular ions.

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