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| Title: | A TUNABLE OPTICAL PARAMETRIC OSCILLATOR LASER SYSTEM FOR SINGLE PARTICLE MASS SPECTROMETRY | |
| DOI No: | 10.1142/9789812701879_0033 | |
| Source: | CLUSTERS AND NANO-ASSEMBLIES (pp 281-293) | |
| Author(s): | RAMKUBER T. YADAV
Philip Morris USA Postgraduate Research Program, Richmond VA 23261, USA JOSEPH L. BANYASZ Philip Morris USA Research Center, 4201 Commerce Road, P. O. Box 26583, Richmond VA 23261, USA KENNETH H. SHAFER Philip Morris USA Research Center, 4201 Commerce Road, P. O. Box 26583, Richmond VA 23261, USA MOHAMMAD R. HAJALIGOL Philip Morris USA Research Center, 4201 Commerce Road, P. O. Box 26583, Richmond VA 23261, USA |
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| Abstract: | Highly selective and sensitive methods are required for the on-line detection of organic products in incomplete combustion. One approach is time of flight measurement in conjunction with selective soft ionization. Resonance enhanced multi-photon ionization (REMPI) – time-of-flight mass spectrometry has proven to be well suited for the identification of organic components present in complex gas mixtures. In the present work we describe the integration of a pulsed (20 Hz) optical parametric oscillator (OPO) laser system and an aerosol time of flight mass spectrometer(ATOFMS). The OPO laser system is based on β-barium borate (BBO) crystals and is equipped with a frequency doubling option. This solid-state laser has a wide spectral tuning range of 220-1850 nm. The laser is designed to work at a fixed repetition rate to improve beam stability; the maximum allowable deviation in periodicity is 10%. We have designed an external triggering arrangement to facilitate the OPO operation in a random fashion, as required in single particle mass spectrometry. The applicability of the system will be demonstrated through measurements of aerosol particles generated by combustion of biomaterials. The goal of this work is to test how different wavelength affect the laser desorption/ionization process. | |
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