caa a22 4500 445372095 CHVBK 20180317142950.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00340-010-4147-y doi (NATIONALLICENCE)springer-10.1007/s00340-010-4147-y Jet-cooled infrared spectra of molecules and complexes with a cw mode-hop-free external-cavity QCL and a distributed-feedback QCL [Elektronische Daten] [X. Liu, Y. Xu, Z. Su, W. Tam, I. Leonov] The coupling of quantum cascade lasers (QCLs) with an off-axis cavity enhanced absorption (CEA) spectrometer and an astigmatic multiple pass absorption (MPA) spectrometer are described in this paper. A continuous wave (cw) liquid nitrogen cooled distributed-feedback QCL at 5.7μm and a cw room temperature mode-hop-free external-cavity QCL at 6.1μm were employed as the light source. For the CEA spectrometer, the effects of mirror size and laser scan rate were evaluated. For the MPA spectrometer, a pair of astigmatic mirrors with a 55cm mirror distance was aligned to the 366-pass configuration. The jet-cooled samples were generated using a homemade pulsed slit jet nozzle assembly. Two LabVIEW programs were written to automate and synchronize the timing of the laser scan, the pulsed slit jet molecular expansion, and the data acquisition. Infrared spectra of jet-cooled methyl lactate and the Ar-H2O complex and room temperature N2O and NH3 samples were measured using both the rapid scan and the wavelength modulation methods to evaluate the sensitivity and resolution of the CEA and MPA spectrometers. The combination of the MPA spectrometer with the external-cavity QCL using the rapid scan method was found to be the best suited combination to measure high resolution jet-cooled infrared spectra. Springer-Verlag, 2010 Liu X. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut Xu Y. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut Su Z. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut Tam W. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut Leonov I. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut Applied Physics B Springer-Verlag 102/3(2011-03-01), 629-639 0946-2171 102:3<629 2011 102 340 https://doi.org/10.1007/s00340-010-4147-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-010-4147-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu X. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut NATIONALLICENCE 700 1- Xu Y. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut NATIONALLICENCE 700 1- Su Z. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut NATIONALLICENCE 700 1- Tam W. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut NATIONALLICENCE 700 1- Leonov I. Department of Chemistry, University of Alberta, T6G 2G2, Edmonton, Alberta, Canada aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 102/3(2011-03-01), 629-639 0946-2171 102:3<629 2011 102 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer