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Title: Photochemistry of the α-Al2O3-PETN interface

Journal Article · · Molecules
 [1];  [2];  [2]; ORCiD logo [3];  [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Kemerovo State Univ., Kemerovo (Russia); Tomsk Polytechnic Univ., Yurga (Russia)
  3. Univ. of Maryland, College Park, MD (United States); Hamad Bin Khalifa Univ., Doha (Qatar)

Optical absorption measurements are combined with electronic structure calculations to explore photochemistry of an α-Al2O3-PETN interface formed by a nitroester (pentaerythritol tetranitrate, PETN, C5H8N4O12) and a wide band gap aluminum oxide (α-Al2O3) substrate. The first principles modeling is used to deconstruct and interpret the α-Al2O3-PETN absorption spectrum that has distinct peaks attributed to surface F0-centers and surfacePETN transitions. We predict the low energy α-Al2O3 F0-centerPETN transition, producing the excited triplet state, and α-Al2O3 F-0-centerPETN charge transfer, generating the PETN anion radical. This implies that irradiation by commonly used lasers can easily initiate photodecomposition of both excited and charged PETN at the interface. As a result, the feasible mechanism of the photodecomposition is proposed.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC); (NERSC); US ONR; ONR Global; NSF IRD program; Ministry of Education and Science of Russian Federation; NSF XSEDE; Stampede supercomputing system at TACC/UT Austin
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1264472
Journal Information:
Molecules, Vol. 21, Issue 3; ISSN 1420-3049
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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