Cavity ring-down spectroscopy of OH radicals in low pressure flame

S. Cheskis; I. Derzy; V. A. Lozovsky; A. Kachanov; D. Romanini

doi:10.1007/s003400050404

Cavity ring-down spectroscopy of OH radicals in low pressure flame

S. Cheskis, I. Derzy, V. A. Lozovsky, A. Kachanov, D. Romanini

School of Chemistry

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

Abstract

Cavity ring-down laser spectroscopy (CRDS) is used to measure the OH concentration profile and the rotational temperature profile in low-pressure (30 torr) methane/ air flames. Very high sensitivity (2 × 10¹⁰ molecules/cm³) and large dynamic range (more than 20000) are demonstrated. CRDS also provides accurate temperature measurements, with statistical errors less than 2%. Measured concentration profiles are in reasonable agreement with calculated values. It is observed that in the preflame zone (where the temperature is about 1000 K), the OH concentration at the first vibrational excited state is about seven times larger than the equilibrium OH(υ″ = 1) concentration at this temperature.

Original language	English
Pages (from-to)	377-381
Number of pages	5
Journal	Applied Physics B: Lasers and Optics
Volume	66
Issue number	3
DOIs	https://doi.org/10.1007/s003400050404
State	Published - 1998

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abstract = "Cavity ring-down laser spectroscopy (CRDS) is used to measure the OH concentration profile and the rotational temperature profile in low-pressure (30 torr) methane/ air flames. Very high sensitivity (2 × 1010 molecules/cm3) and large dynamic range (more than 20000) are demonstrated. CRDS also provides accurate temperature measurements, with statistical errors less than 2%. Measured concentration profiles are in reasonable agreement with calculated values. It is observed that in the preflame zone (where the temperature is about 1000 K), the OH concentration at the first vibrational excited state is about seven times larger than the equilibrium OH(υ″ = 1) concentration at this temperature.",

author = "S. Cheskis and I. Derzy and Lozovsky, {V. A.} and A. Kachanov and D. Romanini",

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AU - Derzy, I.

AU - Lozovsky, V. A.

AU - Kachanov, A.

AU - Romanini, D.

PY - 1998

Y1 - 1998

N2 - Cavity ring-down laser spectroscopy (CRDS) is used to measure the OH concentration profile and the rotational temperature profile in low-pressure (30 torr) methane/ air flames. Very high sensitivity (2 × 1010 molecules/cm3) and large dynamic range (more than 20000) are demonstrated. CRDS also provides accurate temperature measurements, with statistical errors less than 2%. Measured concentration profiles are in reasonable agreement with calculated values. It is observed that in the preflame zone (where the temperature is about 1000 K), the OH concentration at the first vibrational excited state is about seven times larger than the equilibrium OH(υ″ = 1) concentration at this temperature.

AB - Cavity ring-down laser spectroscopy (CRDS) is used to measure the OH concentration profile and the rotational temperature profile in low-pressure (30 torr) methane/ air flames. Very high sensitivity (2 × 1010 molecules/cm3) and large dynamic range (more than 20000) are demonstrated. CRDS also provides accurate temperature measurements, with statistical errors less than 2%. Measured concentration profiles are in reasonable agreement with calculated values. It is observed that in the preflame zone (where the temperature is about 1000 K), the OH concentration at the first vibrational excited state is about seven times larger than the equilibrium OH(υ″ = 1) concentration at this temperature.

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Cavity ring-down spectroscopy of OH radicals in low pressure flame

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