A MICROSCOPIC MODEL FOR THE 2ND-HARMONIC GENERATION FROM C-60

Authors
KOOPMANS B JANNER AM GUARDINI R JONKMAN HT SAWATZKY GA VANDERWOUDE F
Citation
B. Koopmans et al., A MICROSCOPIC MODEL FOR THE 2ND-HARMONIC GENERATION FROM C-60, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 256, 1994, pp. 299-306
Citations number
12
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
256
Year of publication
1994
Pages
299 - 306
Database
ISI
SICI code
1058-725X(1994)256:<299:AMMFT2>2.0.ZU;2-1
Abstract
We discuss the microscopic origin of the Second-Harmonic Generation (S HG) resonance at hBAR omega=1.81 eV, based on spectroscopic and thickn ess dependent SHG measurements on C-60 thin films. We assign the three -level diagram responsible for the observed SHG resonance, and show it to be of magnetic-dipole-induced origin. Furthermore we explain the a bsence of almost any surface contributions, and the narrow line width of the involved HOMO-LUMO (1(1)A(g)-->1(1)T(1g)) excitation at 1.81 eV .