TY - JOUR
T1 - Ultraviolet photoelectron spectroscopy of semiconductor clusters
T2 - Silicon and germanium
AU - Cheshnovsky, O.
AU - Yang, S. H.
AU - Pettiette, C. L.
AU - Craycraft, M. J.
AU - Liu, Y.
AU - Smalley, R. E.
N1 - Funding Information:
The authorsw ouldl ike to acknowledgJ.eM . Alford and R.T. Laaksonenfo r help in thep rogramminogf the trajectoriess imulations.D evelopmento f UPS ~pabi~tyi n this grouph asthus far beenp rimarily supportedb y internalR ice Universityf undsa ndt he RobertA . WelchF oundation.S upportf or semicon-ductorc lusterr esearchfr om the US Army Research Office is gratefullya cknowledgedM.a jor portionso f thec lusterb eama nda ssociatelda sera pparatuus sed herew eres upportedb y the Departmenot f Energy andN ationalS cienceF oundationin projectsfo cused on bare metal clustersa nd chemisorbedc lusters, respectively.
PY - 1987/7/17
Y1 - 1987/7/17
N2 - Ultraviolet photoelectron spectra (UPS) are reported here for semiconductor clusters prepared in a supersonic beam. Using a new magnetically focused time-of-flight photoelectron spectrometer, UPS spectra were obtained for mass-selected negative cluster ions of silicon and germanium in the 3-12-atom size range. An ArF excimer laser (6.4 eV) was used for photodetachment, enabling the first 3-4 eV of the valence band structure of the clusters to be probed. With few exceptions, the UPS data for corresponding clusters of the two semiconductors were remarkably similar. The spectra suggest that clusters 4, 6, 7, and 10 of silicon and 4, 6 and 7 of germanium are closed-shell species with band gaps of 1 to 1.5 eV.
AB - Ultraviolet photoelectron spectra (UPS) are reported here for semiconductor clusters prepared in a supersonic beam. Using a new magnetically focused time-of-flight photoelectron spectrometer, UPS spectra were obtained for mass-selected negative cluster ions of silicon and germanium in the 3-12-atom size range. An ArF excimer laser (6.4 eV) was used for photodetachment, enabling the first 3-4 eV of the valence band structure of the clusters to be probed. With few exceptions, the UPS data for corresponding clusters of the two semiconductors were remarkably similar. The spectra suggest that clusters 4, 6, 7, and 10 of silicon and 4, 6 and 7 of germanium are closed-shell species with band gaps of 1 to 1.5 eV.
UR - http://www.scopus.com/inward/record.url?scp=0001507333&partnerID=8YFLogxK
U2 - 10.1016/0009-2614(87)80353-6
DO - 10.1016/0009-2614(87)80353-6
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AN - SCOPUS:0001507333
SN - 0009-2614
VL - 138
SP - 119
EP - 124
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 2-3
ER -