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Title: Absorption spectrum of NO in the {gamma}(O, O) band

Abstract

A promising technique for determining the concentration of nitrogen oxide in the air of an industrial zone and in process gases is the measurement of the absorption of UV radiation by this molecule in the {gamma}(O,O) band with the center of {lambda}{sub 0} = 226.5 nm. This band corresponds to the transition X{sup 2}{Pi}{yields}{Alpha}{sup 2}{Sigma} of the NO molecule and is characterized by a complex rotational structure consisting of about 400 lines. This structure cannot be resolved completely by most spectral instruments. However, if the width of the spread function of the device is perceptibly smaller than the width of the given absorption band ({approx_equal}2 nm), but larger than the characteristic space between rotational lines ({approx_equal}0.02 nm), then the recorded transmission spectra of NO are almost insensitive to a change in the form of this function. In the given case, to describe the transmission spectrum it is possible to use the absorption coefficient averaged over rotational lines. And even though the Bouger-Lambert-Beer law is not strictly applicable for this spectrum, the dependence of the transmission spectrum of NO on the optical thickness, temperature, and pressure of the broadening gas can be represented in the form of an empirical dependence thatmore » can be useful in practice, for example, when processing the absorption spectra recorded by dispersion gas analyzers. Thus, the need for complex and laborious calculations is avoided, and this simplifies considerably the instrumental implementation of this method of measuring the concentration of NO. The object of the present work is to determine the empirical dependence of the absorption spectrum of NO in the {gamma}(O, O) band on the optical thickness, temperature, and pressure of the broadening gas in the ranges most frequently encountered in operation of dispersion gas analyzers.« less

Authors:
;  [1]
  1. Joint Institute of High Temperatures of the Russian Academy of Sciences, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
161866
Resource Type:
Journal Article
Journal Name:
Journal of Applied Spectroscopy
Additional Journal Information:
Journal Volume: 61; Journal Issue: 5-6; Other Information: PBD: May-Jun 1995; TN: Translated from Zhurnal Prikladnoi Spektroskopii; 61: Nos. 5-6, 377-380(Nov-Dec 1994)
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; NITRIC OXIDE; ABSORPTION SPECTROSCOPY; CHEMICAL REACTION YIELD

Citation Formats

Zobnin, A V, and Korotkov, A N. Absorption spectrum of NO in the {gamma}(O, O) band. United States: N. p., 1995. Web.
Zobnin, A V, & Korotkov, A N. Absorption spectrum of NO in the {gamma}(O, O) band. United States.
Zobnin, A V, and Korotkov, A N. 1995. "Absorption spectrum of NO in the {gamma}(O, O) band". United States.
@article{osti_161866,
title = {Absorption spectrum of NO in the {gamma}(O, O) band},
author = {Zobnin, A V and Korotkov, A N},
abstractNote = {A promising technique for determining the concentration of nitrogen oxide in the air of an industrial zone and in process gases is the measurement of the absorption of UV radiation by this molecule in the {gamma}(O,O) band with the center of {lambda}{sub 0} = 226.5 nm. This band corresponds to the transition X{sup 2}{Pi}{yields}{Alpha}{sup 2}{Sigma} of the NO molecule and is characterized by a complex rotational structure consisting of about 400 lines. This structure cannot be resolved completely by most spectral instruments. However, if the width of the spread function of the device is perceptibly smaller than the width of the given absorption band ({approx_equal}2 nm), but larger than the characteristic space between rotational lines ({approx_equal}0.02 nm), then the recorded transmission spectra of NO are almost insensitive to a change in the form of this function. In the given case, to describe the transmission spectrum it is possible to use the absorption coefficient averaged over rotational lines. And even though the Bouger-Lambert-Beer law is not strictly applicable for this spectrum, the dependence of the transmission spectrum of NO on the optical thickness, temperature, and pressure of the broadening gas can be represented in the form of an empirical dependence that can be useful in practice, for example, when processing the absorption spectra recorded by dispersion gas analyzers. Thus, the need for complex and laborious calculations is avoided, and this simplifies considerably the instrumental implementation of this method of measuring the concentration of NO. The object of the present work is to determine the empirical dependence of the absorption spectrum of NO in the {gamma}(O, O) band on the optical thickness, temperature, and pressure of the broadening gas in the ranges most frequently encountered in operation of dispersion gas analyzers.},
doi = {},
url = {https://www.osti.gov/biblio/161866}, journal = {Journal of Applied Spectroscopy},
number = 5-6,
volume = 61,
place = {United States},
year = {Mon May 01 00:00:00 EDT 1995},
month = {Mon May 01 00:00:00 EDT 1995}
}