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Title: Soft X-ray spectroscopy of nanoparticles by velocity map imaging

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4982822· OSTI ID:1454494
ORCiD logo [1];  [1];  [2]; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry

Velocity map imaging (VMI), a technique traditionally used to study chemical dynamics in the gas phase, is applied to study X-ray photoemission from aerosol nanoparticles. Soft X-rays from the Advanced Light Source synchrotron, probe a beam of nanoparticles, and the resulting photoelectrons are velocity mapped to obtain their kinetic energy distributions. A new design of the VMI spectrometer is described. The spectrometer is benchmarked by measuring vacuum ultraviolet photoemission from gas phase xenon and squalene nanoparticles followed by measurements using soft X-rays. It is demonstrated that the photoelectron distribution from X-ray irradiated squalene nanoparticles is dominated by secondary electrons. By scanning the photon energies and measuring the intensities of these secondary electrons, a near edge X-ray absorption fine structure (NEXAFS) spectrum is obtained. The NEXAFS technique is used to obtain spectra of aqueous nanoparticles at the oxygen K edge. By varying the position of the aqueous nanoparticle beam relative to the incident X-ray beam, evidence is presented such that the VMI technique allows for NEXAFS spectroscopy of water in different physical states. Finally, we discuss the possibility of applying VMI methods to probe liquids and solids via X-ray spectroscopy.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231; DGE-1106400
OSTI ID:
1454494
Alternate ID(s):
OSTI ID: 1361864
Journal Information:
Journal of Chemical Physics, Vol. 147, Issue 1; Related Information: © 2017 U.S. Government.; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Size-dependent ion emission asymmetry of free NaCl nanoparticles excited by intense femtosecond laser pulses journal January 2019
Synthesis of microporous silica nanoparticles to study water phase transitions by vibrational spectroscopy journal January 2019
Fundamental understanding of chemical processes in extreme ultraviolet resist materials journal October 2018
Enabling liquid vapor analysis using synchrotron VUV single photon ionization mass spectrometry with a microfluidic interface journal November 2018
Velocity map imaging of inelastic and elastic low energy electron scattering in organic nanoparticles journal November 2019
Velocity map imaging of inelastic and elastic low energy electron scattering in organic nanoparticles text January 2019

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