Deposited films were prepared by ablation of disk-like targets of 3,4,9,10- perylenetetracarboxylic dianhydride (PTCDA) and mixed targets of PTCDA with cobalt (PTCDA-Co) and copper powders (PTCDA-Cu) using the third harmonic of a Nd:YAG laser (355 nm) at fluences ranging from 0.1 to 1.0 Jcm -2pulse-1. FT-IR and Raman spectroscopy showed that ablation of PTCDA-Cu at more than 500 mJcm-2pulse-1 led to an effective elimination reaction of the anhydride groups of PTCDA as well as PTCDA-Co at more than 700 mJcm-2pulse-1. In ablation of PTCDA-Co and PTCDA-Cu, plasma emission was observed around 500 nm. With increasing fluence, addition to the plasma emission, peaks at 437, 469, 513 and 550 nm coming from C2 radicals were observed, suggesting that PTCDA was partially decomposed into C2. TOF mass spectra in ablation of PTCDA-Co showed fragments of PTCDA without one or two anhydride groups as well as CoCn+ (n0-5) and Co (CO)2+.
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