TY - JOUR
T1 - Mechanism of Intact Adsorbed Molecules Ejection Using High Intensity Laser Pulses
AU - Furman, David
AU - Kosloff, Ronnie
AU - Zeiri, Yehuda
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/5/26
Y1 - 2016/5/26
N2 - A novel universal mechanism for the ejection of intact, neutral molecules from thin films into the gas phase initiated by high intensity ultrashort laser pulses is described. The proposed mechanism is substantiated by detailed reactive molecular dynamics simulations. In the present study, 2,4,6-trinitrotoluene (TNT) and cryogenic benzene are used as thin film targets. According to the proposed mechanism, the laser pulse, absorbed by the substrate, forms a hot plasma plume which in turn generates a shock wave that moves across the deposited thin film. The simulations indicate that the shock wave propagates through the thin film without dissipation and eventually ejects molecules from the free surface. It is revealed that the proposed mechanism is feasible only in a limited range of shock velocities. The results compare well qualitatively with recent experimental findings of femtosecond, nonresonant, laser-induced desorption. Simple experimental measurements are outlined to validate the proposed mechanism.
AB - A novel universal mechanism for the ejection of intact, neutral molecules from thin films into the gas phase initiated by high intensity ultrashort laser pulses is described. The proposed mechanism is substantiated by detailed reactive molecular dynamics simulations. In the present study, 2,4,6-trinitrotoluene (TNT) and cryogenic benzene are used as thin film targets. According to the proposed mechanism, the laser pulse, absorbed by the substrate, forms a hot plasma plume which in turn generates a shock wave that moves across the deposited thin film. The simulations indicate that the shock wave propagates through the thin film without dissipation and eventually ejects molecules from the free surface. It is revealed that the proposed mechanism is feasible only in a limited range of shock velocities. The results compare well qualitatively with recent experimental findings of femtosecond, nonresonant, laser-induced desorption. Simple experimental measurements are outlined to validate the proposed mechanism.
UR - http://www.scopus.com/inward/record.url?scp=84973163983&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.6b03711
DO - 10.1021/acs.jpcc.6b03711
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AN - SCOPUS:84973163983
SN - 1932-7447
VL - 120
SP - 11306
EP - 11312
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 20
ER -