Title: The characterization of selected drugs with infrared laser desorption/tunable synchrotron vacuum ultraviolet photoionization mass spectrometry Author(s): Pan, Y (Pan, Yang); Yin, H (Yin, Hao); Zhang, TC (Zhang, Taichang); Guo, HJ (Guo, Huijun); Sheng, LS (Sheng, Liusi); Qi, F (Qi, Fei) Source: RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 22 (16): 2515-2520 AUG 2008