TY - JOUR
T1 - Desorption of large molecules with light-element clusters
T2 - Effects of cluster size and substrate nature
AU - Delcorte, Arnaud
AU - Garrison, Barbara J.
N1 - Funding Information:
This work was supported by the Belgian Fonds National pour la Recherche Scientifique (FNRS), the French Community of Belgium via the Concerted Research Action programme (ARC NANHYMO: convention 07/12-003) and the European Community (EC) FP7 program through the project grant CP-TP 200613-2 (“3D-Nanochemiscope”). B.J.G. acknowledges financial support from grant CHE-0910564, which is administered by the Chemistry Division of the National Science Foundation. Computational resources were provided by the academic Services and Emerging technologies (ASET). The authors are also thankful to the ASET staff for assistance with the Lion-xo and Lion-xj clusters. The theoretical and computational biophysics group of the University of Illinois at Urbana-Champaign is acknowledged for the development and free access to the visualization software VMD, used to produce Figures 2 and 3.
PY - 2011/7/15
Y1 - 2011/7/15
N2 - This contribution focuses on the conditions required to desorb a large hydrocarbon molecule using light-element clusters. The test molecule is a 7.5 kDa coil of polystyrene (PS61). Several projectiles are compared, from C 60 to 110 kDa organic droplets and two substrates are used, amorphous polyethylene and mono-crystalline gold. Different aiming points and incidence angles are examined. Under specific conditions, 10 keV nanodrops can desorb PS61 intact from a gold substrate and from a soft polyethylene substrate. The prevalent mechanism for the desorption of intact and 'cold' molecules is one in which the molecules are washed away by the projectile constituents and entrained in their flux, with an emission angle close to ∼70°. The effects of the different parameters on the dynamics and the underlying physics are discussed in detail and the predictions of the model are compared with other published studies.
AB - This contribution focuses on the conditions required to desorb a large hydrocarbon molecule using light-element clusters. The test molecule is a 7.5 kDa coil of polystyrene (PS61). Several projectiles are compared, from C 60 to 110 kDa organic droplets and two substrates are used, amorphous polyethylene and mono-crystalline gold. Different aiming points and incidence angles are examined. Under specific conditions, 10 keV nanodrops can desorb PS61 intact from a gold substrate and from a soft polyethylene substrate. The prevalent mechanism for the desorption of intact and 'cold' molecules is one in which the molecules are washed away by the projectile constituents and entrained in their flux, with an emission angle close to ∼70°. The effects of the different parameters on the dynamics and the underlying physics are discussed in detail and the predictions of the model are compared with other published studies.
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U2 - 10.1016/j.nimb.2010.11.023
DO - 10.1016/j.nimb.2010.11.023
M3 - Article
AN - SCOPUS:79959213376
VL - 269
SP - 1572
EP - 1577
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
IS - 14
ER -