White Light Optical Waveguide Detection of Transient Absorption Spectra in Ultrathin Organic Films upon Pulsed Laser Excitation

摘要

White light optical waveguide (WOWG) method was applied transient absorption spectroscopy of ultrathin polymer films. Tetraphenylporphinetetrasulfonic acid (TPPS) in poly(vinyl alcohol) films on the surface of OWG glass was excited with the second harmonics of a nanosecond Nd: YAG laer. The transient absorption spectrum of excited triplet TPPS was detected highly sensitively for a film with the absorbance at 532 nm of only 0.0005.