Applying a Spray-jet Method for Measuring Naphthalene Derivatives
by Nanosecond Laser MPI TOF-MS

Hidenori Shinohara*, Toshiki Yamada, Maofa Ge, Katsumi Kimura †, and Shinro Mashiko
National Institute of Information & Communications Technology, 588-2 Iwaoka,Nishi-ku,Kobe 651-2401
† National Institute for Materials Science, 3-13, Sakura, Tsukuba 305-0003

(Received November 12, 2004; CL-041362)



A molecular-beam apparatus with a spray-jet method was applied for the laser TOF-MS study of naphthalene derivatives, 2-naphthoic acid(2NA), and 1,5-dihydroxynaphthalene(DHN). The results obtained by this method are compared with those ob-tained by the traditional sample-heating inlet method. The spray-jet method strongly improved the signal-to-noise ratio (S/N), compared to the traditional method. In addition, the intermolec-ular clusters due to hydrogen-bond formation were observed in case of the DHN system.