Generation and 355 nm laser photodissociation of nitrous acid (HONO) and HONO-water clusters

C. L. Ning, J. Pfab

Research output: Contribution to journalArticle

Abstract

A stable source for the continuous production of high concentrations of gaseous nitrous acid (HONO) up to 5000 ppm has been developed, characterized, and employed for a study of the near-UV photodissociation of HONO and HONO-water clusters in a continuous supersonic free-jet expansion. The source consists of a flow reactor fed with aqueous reagent solutions purged by an inert carrier gas at flow rates up to 1 L/min. The dynamics of the photodissociation of jet-cooled HONO and HONO-water clusters at 355 nm have been studied by measuring the rotational distribution of the nascent NO (?? = 2) photofragment using the laser-induced fluorescence (LIF) technique. Distinctly bimodal rotational distributions have been observed for the nascent, vibrationally excited NO, which are well described by the sum of two components: a Gaussian distribution at high J and a 170 K Boltzmann distribution in the low-J range reflecting photodissociation of bare HONO , HONO-H2O complexes, and small HONO water clusters.

Original languageEnglish
Pages (from-to)6008-6014
Number of pages7
JournalJournal of Physical Chemistry A
Volume101
Issue number34
Publication statusPublished - 21 Aug 1997

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nitrous acid
photodissociation
water
lasers
Boltzmann distribution
free jets
normal density functions
laser induced fluorescence
reagents
flow velocity
reactors
expansion
gases

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@article{1fdc3e19ae5b40bfbd8b9ba1b7d3f9e0,
title = "Generation and 355 nm laser photodissociation of nitrous acid (HONO) and HONO-water clusters",
abstract = "A stable source for the continuous production of high concentrations of gaseous nitrous acid (HONO) up to 5000 ppm has been developed, characterized, and employed for a study of the near-UV photodissociation of HONO and HONO-water clusters in a continuous supersonic free-jet expansion. The source consists of a flow reactor fed with aqueous reagent solutions purged by an inert carrier gas at flow rates up to 1 L/min. The dynamics of the photodissociation of jet-cooled HONO and HONO-water clusters at 355 nm have been studied by measuring the rotational distribution of the nascent NO (?? = 2) photofragment using the laser-induced fluorescence (LIF) technique. Distinctly bimodal rotational distributions have been observed for the nascent, vibrationally excited NO, which are well described by the sum of two components: a Gaussian distribution at high J and a 170 K Boltzmann distribution in the low-J range reflecting photodissociation of bare HONO , HONO-H2O complexes, and small HONO water clusters.",
author = "Ning, {C. L.} and J. Pfab",
year = "1997",
month = "8",
day = "21",
language = "English",
volume = "101",
pages = "6008--6014",
journal = "Journal of Physical Chemistry A",
issn = "1089-5639",
publisher = "American Chemical Society",
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}

Generation and 355 nm laser photodissociation of nitrous acid (HONO) and HONO-water clusters. / Ning, C. L.; Pfab, J.

In: Journal of Physical Chemistry A, Vol. 101, No. 34, 21.08.1997, p. 6008-6014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Generation and 355 nm laser photodissociation of nitrous acid (HONO) and HONO-water clusters

AU - Ning, C. L.

AU - Pfab, J.

PY - 1997/8/21

Y1 - 1997/8/21

N2 - A stable source for the continuous production of high concentrations of gaseous nitrous acid (HONO) up to 5000 ppm has been developed, characterized, and employed for a study of the near-UV photodissociation of HONO and HONO-water clusters in a continuous supersonic free-jet expansion. The source consists of a flow reactor fed with aqueous reagent solutions purged by an inert carrier gas at flow rates up to 1 L/min. The dynamics of the photodissociation of jet-cooled HONO and HONO-water clusters at 355 nm have been studied by measuring the rotational distribution of the nascent NO (?? = 2) photofragment using the laser-induced fluorescence (LIF) technique. Distinctly bimodal rotational distributions have been observed for the nascent, vibrationally excited NO, which are well described by the sum of two components: a Gaussian distribution at high J and a 170 K Boltzmann distribution in the low-J range reflecting photodissociation of bare HONO , HONO-H2O complexes, and small HONO water clusters.

AB - A stable source for the continuous production of high concentrations of gaseous nitrous acid (HONO) up to 5000 ppm has been developed, characterized, and employed for a study of the near-UV photodissociation of HONO and HONO-water clusters in a continuous supersonic free-jet expansion. The source consists of a flow reactor fed with aqueous reagent solutions purged by an inert carrier gas at flow rates up to 1 L/min. The dynamics of the photodissociation of jet-cooled HONO and HONO-water clusters at 355 nm have been studied by measuring the rotational distribution of the nascent NO (?? = 2) photofragment using the laser-induced fluorescence (LIF) technique. Distinctly bimodal rotational distributions have been observed for the nascent, vibrationally excited NO, which are well described by the sum of two components: a Gaussian distribution at high J and a 170 K Boltzmann distribution in the low-J range reflecting photodissociation of bare HONO , HONO-H2O complexes, and small HONO water clusters.

M3 - Article

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JF - Journal of Physical Chemistry A

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ER -