ir2时间分辨红外光谱.pdfVIP

Nanosecond Time-Resolved Infrared Spectroscopy with a Dispersive Scanning Spectrometer T E T S U R O Y U Z A W A , C H I H I R O KATO,* M I C H A E L W. G E O R G E , t a n d H I R O - O H A M A G U C H I ~ Molecular SpectroscopyLaboratory, Kanagawa Academy of Science and Technology, 3-2-1 Sakato, Kawasaki 213, Japan A nanosecond time-resolved infrared spectroscopic system based on a In the continuation of our effort to develop a versatile dispersive scanning spectrometer has been constructed. This is an ad- fast infrared spectrometer based on a dispersive scanning vanced version of a similar system reported in a previous paper; the time monochromator,4-6 we have recently made significant resolution has been improved from 1 us to 50 ns and the sensitivity from progress thanks to some newly introduced hardware in- 10 -4 in intensity changes to 10 -6 . These have been achieved by the use cluding a high-luminance ceramic infrared light source, of a high-temperature ceramic infrared light source, a photovoltaic MCT detector, and a low-noise, wide-band preamplifier developed specifically a fast photovoltaic MCT detector, and an ultra-low-noise for the present purpose. Time-resolved infrared spectra of a few samples wide-band preamplifier. The results obtained with this of photochemical and photobiological interests are presented to show new system have been partly published in differentjour- the capability of the system. The origin of the thermal artifacts, which nals. 7-~ Here, we wish to give a full account of the in- have been found to hamper the time-resolved infrared measurements stru