Eur. Phys. J. Special Topics 153, 37-40 (2008)
https://doi.org/10.1140/epjst/e2008-00388-5

Photo-acoustic spectroscopy of polymer with infrared free electron laser

¹ Research Institute of Instrumentation Frontier (RIIF), Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, Japan
² National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Tsukuba, Ibaraki, 305-8568, Japan

Corresponding author: m.yasumoto@aist.go.jp

Abstract

We have been proposing a new photo acoustic spectroscopy (PAS) method with an infrared free electron laser (IR-FEL). The IR-FEL is a continuous tunable laser in the lasing wavelength in an finger-print wavelength region with high peak power. The IR-FEL resonantly induce the specific molecular vibration of the samples, resulting casue the photo acoustic pheneomena with high sensitivity. Thus, the new PAS method with the IR-FEL is high sensitive analysis method applicable to low absorbance measurement. In this study we show the feasibility of application of the MIR-FEL to the photon source of the PAS method by measuring the PAS spectrum of polymers such as a poly ethylene terephthalate (PET) film. In addition, we construct an imaging system of the FEL-PAS to make a map of the PAS signal with a high spatial resolution that is a diffraction limit of the IR-FEL.