Fourier transform infrared spectrometer for a single aerosol particle

Gideon Sageev Grader; Richard C. Flagan; John H. Seinfeld; Stephen Arnold

doi:10.1063/1.1139220

Fourier transform infrared spectrometer for a single aerosol particle

Gideon Sageev Grader, Richard C. Flagan, John H. Seinfeld, Stephen Arnold

Research output: Contribution to journal › Article › peer-review

Abstract

A spectrometer is reported here for obtaining the infrared spectrum of a single aqueous aerosol particle by a Fourier transform technique. The particle is held in an electrodynamic balance and irradiated simultaneously by the infrared output from a Michelson interferometer and the visible light from a dye laser. The size of the particle is modulated by chopping the IR beam, and the resulting visible scattered light fluctuation is detected at 90° with a photomultiplier tube. The amplitude of the scattered light fluctuation is measured with a lock-in amplifier at each interferometer mirror position. The electronic circuitry for stepping the interferometer mirror is presented and discussed. Inverting the lock-in signal by a discrete fast Fourier transform routine (FFT) yields the particle absorption spectrum. The resulting spectrum for an (NH₄)₂SO₄ droplet is presented.

Original language	English (US)
Pages (from-to)	584-587
Number of pages	4
Journal	Review of Scientific Instruments
Volume	58
Issue number	4
DOIs	https://doi.org/10.1063/1.1139220
State	Published - 1987

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Instrumentation

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10.1063/1.1139220

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title = "Fourier transform infrared spectrometer for a single aerosol particle",

abstract = "A spectrometer is reported here for obtaining the infrared spectrum of a single aqueous aerosol particle by a Fourier transform technique. The particle is held in an electrodynamic balance and irradiated simultaneously by the infrared output from a Michelson interferometer and the visible light from a dye laser. The size of the particle is modulated by chopping the IR beam, and the resulting visible scattered light fluctuation is detected at 90° with a photomultiplier tube. The amplitude of the scattered light fluctuation is measured with a lock-in amplifier at each interferometer mirror position. The electronic circuitry for stepping the interferometer mirror is presented and discussed. Inverting the lock-in signal by a discrete fast Fourier transform routine (FFT) yields the particle absorption spectrum. The resulting spectrum for an (NH4)2SO4 droplet is presented.",

author = "Grader, {Gideon Sageev} and Flagan, {Richard C.} and Seinfeld, {John H.} and Stephen Arnold",

year = "1987",

doi = "10.1063/1.1139220",

language = "English (US)",

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pages = "584--587",

journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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T1 - Fourier transform infrared spectrometer for a single aerosol particle

AU - Grader, Gideon Sageev

AU - Flagan, Richard C.

AU - Seinfeld, John H.

AU - Arnold, Stephen

PY - 1987

Y1 - 1987

N2 - A spectrometer is reported here for obtaining the infrared spectrum of a single aqueous aerosol particle by a Fourier transform technique. The particle is held in an electrodynamic balance and irradiated simultaneously by the infrared output from a Michelson interferometer and the visible light from a dye laser. The size of the particle is modulated by chopping the IR beam, and the resulting visible scattered light fluctuation is detected at 90° with a photomultiplier tube. The amplitude of the scattered light fluctuation is measured with a lock-in amplifier at each interferometer mirror position. The electronic circuitry for stepping the interferometer mirror is presented and discussed. Inverting the lock-in signal by a discrete fast Fourier transform routine (FFT) yields the particle absorption spectrum. The resulting spectrum for an (NH4)2SO4 droplet is presented.

AB - A spectrometer is reported here for obtaining the infrared spectrum of a single aqueous aerosol particle by a Fourier transform technique. The particle is held in an electrodynamic balance and irradiated simultaneously by the infrared output from a Michelson interferometer and the visible light from a dye laser. The size of the particle is modulated by chopping the IR beam, and the resulting visible scattered light fluctuation is detected at 90° with a photomultiplier tube. The amplitude of the scattered light fluctuation is measured with a lock-in amplifier at each interferometer mirror position. The electronic circuitry for stepping the interferometer mirror is presented and discussed. Inverting the lock-in signal by a discrete fast Fourier transform routine (FFT) yields the particle absorption spectrum. The resulting spectrum for an (NH4)2SO4 droplet is presented.

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DO - 10.1063/1.1139220

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JO - Review of Scientific Instruments

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IS - 4

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Fourier transform infrared spectrometer for a single aerosol particle

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