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Identification of two-photon states in phthalocyanines by third harmonic generation spectroscopy

✍ Scribed by María A. Díaz-García; Fernando Agulló-López; William E. Torruellas; George I. Stegeman

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
447 KB
Volume
235
Category
Article
ISSN
0009-2614

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✦ Synopsis

The dispersive behaviour of the magnitude and phase of X3 (-3to; to, to, to) of sublimated metal-free (PcH 2) and copper phthalocyanine (PcCu) thin fihns has been investigated via third harmonic generation (THG) spectroscopy in the range of 950 to 2000 rim. A two-photon state placed at around 500 nrn, between the two one-photon allowed levels, has been identified and correlated with transitions from the a u to the b l*~ levels. In PcCu an additional two-photon state located at the lower energy side of the Q band, likely associated with a d-d transition, has also been inferred from the spectrum.

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