Cavity ring-down spectroscopy measurements of single aerosol particle extinction. I. The effect of position of a particle within the laser beam on extinction

被引：53

作者：

Butler, Timothy J. A. ^{[1
]}

Miller, Johanna L. ^{[1
]}

Orr-Ewing, Andrew J. ^{[1
]}

机构：

[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England

来源：

JOURNAL OF CHEMICAL PHYSICS | 2007年 / 126卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.2723735

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A continuous wave distributed feedback diode laser operating in the near infrared at wavelengths close to 1650 nm has been used to measure the extinction of light by single aerosol particles. The technique of optical feedback cavity ring-down spectroscopy (CRDS) was used for measurement of CRDS events at a repetition rate of 1.25 kHz. This very high repetition rate enabled multiple measurements of the extinction of light by single aerosol particles for the first time and demonstrated the dependence of light scattering on the position of a particle within the laser beam. A model is proposed to explain quantitatively this phenomenon. The minimum detectable dimensionless extinction coefficient epsilon(min) was determined to be 3x10(-6). Extinction values obtained for single spherical polymer beads from a monodisperse sample of particles of diameter of 4 mu m are in near-quantitative agreement with the values calculated by the Mie scattering theory. The deviations from the Mie theory expected for measurement of extinction by CRDS using a continuous wave laser are discussed in the companion paper. (C) 2007 American Institute of Physics.

引用

页数：7

共 30 条

[1] SOOT-VISUALIZATION STRATEGIES USING LASER TECHNIQUES - LASER-INDUCED FLUORESCENCE IN C2 FROM LASER-VAPORIZED SOOT AND LASER-INDUCED SOOT INCANDESCENCE [J].

BENGTSSON, PE ;

ALDEN, M .

APPLIED PHYSICS B-LASERS AND OPTICS, 1995, 60 (01) :51-59

[2] Cavity ring-down spectroscopy: Experimental schemes and applications [J].

Berden, G ;

Peeters, R ;

Meijer, G .

INTERNATIONAL REVIEWS IN PHYSICAL CHEMISTRY, 2000, 19 (04) :565-607

[3]

Brasseur G.P., 1999, Atmospheric Chemistry and Global Change

[4] Absorption and scattering characterization of airborne microparticulates by a cavity ringdown technique [J].

Bulatov, V ;

Chen, YH ;

Khalmanov, A ;

Schechter, I .

ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 2006, 384 (01) :155-160

[5] Aerosol analysis by cavity-ring-down laser spectroscopy [J].

Bulatov, V ;

Fisher, M ;

Schechter, I .

ANALYTICA CHIMICA ACTA, 2002, 466 (01) :1-9

[6] Measurement of SiH2 density in a discharge by intracavity laser absorption spectroscopy and CW cavity ring-down spectroscopy [J].

Campargue, A ;

Romanini, D ;

Sadeghi, N .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1998, 31 (10) :1168-1175

[7]

CHARLSON RJ, 1991, TELLUS A, V43, P152, DOI 10.1034/j.1600-0870.1991.00013.x

[8] Sub-ppb NO2 detection by optical feedback cavity-enhanced absorption spectroscopy with a blue diode laser [J].

Courtillot, I. ;

Morville, J. ;

Motto-Ros, V. ;

Romanini, D. .

APPLIED PHYSICS B-LASERS AND OPTICS, 2006, 85 (2-3) :407-412

[9] Applications of the cavity ring-down technique to a large-area rf-plasma reactor [J].

Grangeon, F ;

Monard, C ;

Dorier, JL ;

Howling, AA ;

Hollenstein, C ;

Romanini, D ;

Sadeghi, N .

PLASMA SOURCES SCIENCE & TECHNOLOGY, 1999, 8 (03) :448-456

[10]

[Houghton J.T. IPCC. IPCC.], 2001, CLIMATE CHANGE

← 1 2 3 →