Sensitive Detection and Identification of Isovanillin Aerosol Particles at the pg/cm3Mass Concentration Level Using Raman Spectroscopy

Autor:	Thomas H. Jeys, Adam Shabshelowitz, Salvatore Di Cecca, Roshan L. Aggarwal, L. W. Farrar
Rok vydání:	2015
Předmět:	Range (particle radiation) Resolution (mass spectrometry) Analytical chemistry Isovanillin Pollution Aerosol chemistry.chemical_compound symbols.namesake chemistry Laser cooling Transmittance symbols Environmental Chemistry Mass concentration (chemistry) General Materials Science Raman spectroscopy
Zdroj:	Aerosol Science and Technology. 49:753-756
ISSN:	1521-7388 0278-6826
DOI:	10.1080/02786826.2015.1065955
Popis:	A compact Raman spectroscopy system with high sensitivity to chemical aerosols has been developed. This system has been used to detect isovanillin aerosols with mass concentration of 12 pg/cm3 in a 15 s signal integration period with a signal-to-noise ratio of 32. We believe this represents the lowest chemical aerosol concentration and signal integration period product ever reported for a Raman spectroscopy system. The Raman system includes (i) a 10 W, 532-nm cw laser, (ii) an aerosol flow cell, (iii) a 60× aerosol concentrator, (iv) an f/1.8 Raman spectrometer with a spectral range of 400–1400 cm−1 and a resolution of 4 cm−1, and (v) a low-noise CCD camera (1340 × 400 pixels). The collection efficiency of the Raman system has been determined to be 2.8%. Except for the laser cooling subsystem, the Raman system fits in a 0.61 m × 0.61 m × 0.61 m box.Copyright 2015 American Association for Aerosol Research
Databáze:	OpenAIRE
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