Photo-acoustic spectroscopy of polymer with infrared free electron laser
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: email@example.com
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.
© EDP Sciences, Springer-Verlag, 2008