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Title: High-resolution pulsed-field ionization photoelectron spectroscopy using multi-bunch synchrotron radiation

Abstract

BL9.0.2.2 is the newly constructed experimental End Station 2 at the Chemical Dynamics Beamline 9.0.2 of the Advanced Light Source (ALS). It is dedicated to the high resolution photoionization study of molecules of interest to atmospheric and combustion chemistry. This End Station is equipped with a high resolution scanning monochromator, which has been demonstrated to have a world record resolution of E/{delta}E=70,000. Taking the advantage of the high resolution ALS light, the authors have improved the energy resolution in threshold photoelectron spectroscopy (TPES) to 0.8 meV. The TPES is a popular technique for photoionization experiments at all synchrotron radiation facilities due to its high energy resolution as compared to that of traditional photoelectron spectroscopy (PES). TPES achieves higher energy resolution by preferentially detecting near zero kinetic energy photoelectrons resulting from threshold photoionization. However, the spectra obtained from the TPES technique generally are complicated by the simultaneous detection of electrons with nonzero kinetic energy, which are not fully discriminated against. On the other hand, the spectra obtained from pulsed field ionization photoelectron spectroscopy (PFI-PES) are completely free of the contamination from kinetic electrons. The PFI-PE technique basically involves the detection of the photoelectrons from field ionization of the very high-n Rydbergmore » states, a few cm{sup {minus}1} below the ionization energy (IE), by applying a delayed pulsed electric field. Within a delay of a few microseconds, all the prompt electrons formed from direct ionization will escape from the photoionization region and will not be collected. The authors have recently overcome problems with energy resolution of an electron time-of-flight technique, and incorporated the PFI-PE technique with multi-bunch VUV synchrotron radiation.« less

Authors:
 [1]; ;  [2];  [3]
  1. Lawrence Berkeley National Lab., CA (United States)
  2. Ames Lab., IA (United States)
  3. Ernest Orlando Lawrence Berkeley National Lab., CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (United States)
OSTI Identifier:
604271
Report Number(s):
LBNL-39981
ON: DE97007345; TRN: 98:009576
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1997; Related Information: Is Part Of Advanced light source: Compendium of user abstracts 1993--1996; PB: 622 p.
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; 43 PARTICLE ACCELERATORS; PHOTOELECTRON SPECTROSCOPY; IONIZATION; MOLECULES; COMBUSTION PRODUCTS; THRESHOLD ENERGY

Citation Formats

Hsu, C. W., Evans, M., Ng, C. Y., and Heimann, P. High-resolution pulsed-field ionization photoelectron spectroscopy using multi-bunch synchrotron radiation. United States: N. p., 1997. Web. doi:10.2172/604271.
Hsu, C. W., Evans, M., Ng, C. Y., & Heimann, P. High-resolution pulsed-field ionization photoelectron spectroscopy using multi-bunch synchrotron radiation. United States. https://doi.org/10.2172/604271
Hsu, C. W., Evans, M., Ng, C. Y., and Heimann, P. Tue . "High-resolution pulsed-field ionization photoelectron spectroscopy using multi-bunch synchrotron radiation". United States. https://doi.org/10.2172/604271. https://www.osti.gov/servlets/purl/604271.
@article{osti_604271,
title = {High-resolution pulsed-field ionization photoelectron spectroscopy using multi-bunch synchrotron radiation},
author = {Hsu, C. W. and Evans, M. and Ng, C. Y. and Heimann, P.},
abstractNote = {BL9.0.2.2 is the newly constructed experimental End Station 2 at the Chemical Dynamics Beamline 9.0.2 of the Advanced Light Source (ALS). It is dedicated to the high resolution photoionization study of molecules of interest to atmospheric and combustion chemistry. This End Station is equipped with a high resolution scanning monochromator, which has been demonstrated to have a world record resolution of E/{delta}E=70,000. Taking the advantage of the high resolution ALS light, the authors have improved the energy resolution in threshold photoelectron spectroscopy (TPES) to 0.8 meV. The TPES is a popular technique for photoionization experiments at all synchrotron radiation facilities due to its high energy resolution as compared to that of traditional photoelectron spectroscopy (PES). TPES achieves higher energy resolution by preferentially detecting near zero kinetic energy photoelectrons resulting from threshold photoionization. However, the spectra obtained from the TPES technique generally are complicated by the simultaneous detection of electrons with nonzero kinetic energy, which are not fully discriminated against. On the other hand, the spectra obtained from pulsed field ionization photoelectron spectroscopy (PFI-PES) are completely free of the contamination from kinetic electrons. The PFI-PE technique basically involves the detection of the photoelectrons from field ionization of the very high-n Rydberg states, a few cm{sup {minus}1} below the ionization energy (IE), by applying a delayed pulsed electric field. Within a delay of a few microseconds, all the prompt electrons formed from direct ionization will escape from the photoionization region and will not be collected. The authors have recently overcome problems with energy resolution of an electron time-of-flight technique, and incorporated the PFI-PE technique with multi-bunch VUV synchrotron radiation.},
doi = {10.2172/604271},
url = {https://www.osti.gov/biblio/604271}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {4}
}