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Title: Low energy electron attenuation lengths in core–shell nanoparticles

Here, a velocity map imaging spectrometer is used to measure photoemission from free core–shell nanoparticles, where a salt core is coated with a liquid hydrocarbon shell (i.e. squalane). By varying the radial thickness of the hydrocarbon shell, electron attenuation lengths (EALs) are determined by measuring the decay in photoemission intensity from the salt core. In squalane, electrons with kinetic energy (KE) above 2 eV are found to have EALs of 3–5 nm, whereas electrons with smaller KE (<2 eV) have significantly larger EALs of >15 nm. These results (in the context of other energy-resolved EAL measurements) suggest that the energy dependent behavior of low energy electrons is similar in dielectrics when KE > 2 eV. At this energy the EALs do not appear to exhibit strong energy dependence. However, at very low KE (<2 eV), the EALs diverge and appear to be extremely material dependent.
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [2]
  1. Univ. of California, Berkeley, CA (United States), Dept. of Chemistry; 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
Publication Date:
Grant/Contract Number:
AC02-05CH11231; DGE-1106400
Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 19; Journal Issue: 20; Related Information: © 2017 the Owner Societies.; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1454492

Jacobs, Michael I., Kostko, Oleg, Ahmed, Musahid, and Wilson, Kevin R.. Low energy electron attenuation lengths in core–shell nanoparticles. United States: N. p., Web. doi:10.1039/c7cp00663b.
Jacobs, Michael I., Kostko, Oleg, Ahmed, Musahid, & Wilson, Kevin R.. Low energy electron attenuation lengths in core–shell nanoparticles. United States. doi:10.1039/c7cp00663b.
Jacobs, Michael I., Kostko, Oleg, Ahmed, Musahid, and Wilson, Kevin R.. 2017. "Low energy electron attenuation lengths in core–shell nanoparticles". United States. doi:10.1039/c7cp00663b. https://www.osti.gov/servlets/purl/1454492.
@article{osti_1454492,
title = {Low energy electron attenuation lengths in core–shell nanoparticles},
author = {Jacobs, Michael I. and Kostko, Oleg and Ahmed, Musahid and Wilson, Kevin R.},
abstractNote = {Here, a velocity map imaging spectrometer is used to measure photoemission from free core–shell nanoparticles, where a salt core is coated with a liquid hydrocarbon shell (i.e. squalane). By varying the radial thickness of the hydrocarbon shell, electron attenuation lengths (EALs) are determined by measuring the decay in photoemission intensity from the salt core. In squalane, electrons with kinetic energy (KE) above 2 eV are found to have EALs of 3–5 nm, whereas electrons with smaller KE (<2 eV) have significantly larger EALs of >15 nm. These results (in the context of other energy-resolved EAL measurements) suggest that the energy dependent behavior of low energy electrons is similar in dielectrics when KE > 2 eV. At this energy the EALs do not appear to exhibit strong energy dependence. However, at very low KE (<2 eV), the EALs diverge and appear to be extremely material dependent.},
doi = {10.1039/c7cp00663b},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = 20,
volume = 19,
place = {United States},
year = {2017},
month = {5}
}