Titre :

Online analysis of gas-phase radical reactions using vacuum ultraviolet lamp photoionization and time-of-flight mass spectrometry

Auteur(s) :

Wen, Zuoying [Auteur]
Anhui Institute of Optics and Fine Mechanics
Tang, Xiaofeng [Auteur]
Anhui Institute of Optics and Fine Mechanics
Fittschen, Christa [Auteur]
Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 [PC2A]
Zhang, Cuihong [Auteur]
Anhui Institute of Optics and Fine Mechanics
Wang, Tao [Auteur]
Anhui Institute of Optics and Fine Mechanics
Wang, Chengcheng [Auteur]
Anhui Institute of Optics and Fine Mechanics
Gu, Xuejun [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Weijun [Auteur]
Anhui Institute of Optics and Fine Mechanics

Titre de la revue :

Review of Scientific Instruments

Nom court de la revue :

Review of Scientific Instruments

Numéro :

91

Pagination :

043201

Éditeur :

AIP Publishing

Date de publication :

2020-04-01

Discipline(s) HAL :

Chimie/Chimie théorique et/ou physique
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

Résumé en anglais : [en]

A home-made vacuum ultraviolet photoionization time-of-flight mass spectrometer has been developed and coupled to an atmospheric simulation chamber operated at atmospheric pressure and to a fast flow tube at low pressure ...
Lire la suite >A home-made vacuum ultraviolet photoionization time-of-flight mass spectrometer has been developed and coupled to an atmospheric simulation chamber operated at atmospheric pressure and to a fast flow tube at low pressure (1–10 Torr). Gas sampling from the simulation chamber is realized directly via a capillary effusive beam, and sampling from the flow tube is via a continuous molecular beam inlet. Both devices are connected simultaneously to the ionization chamber of the mass spectrometer and can be switched in-between within minutes to study gas-phase radical reactions of atmospheric interest in a large range of reaction conditions and reaction times (from milliseconds in the flow tube to hours in the simulation chamber). A cage-shaped photoionization source combined with a commercial 10.6 eV krypton lamp has been developed to provide a high ion collection efficiency along the long light path in the cage. This way, a multiplexed detection with high sensitivity down to the sub-parts per billion volume concentration range, e.g., a limit of detection of 0.3 ppbv with an accumulation time of 60 s for benzene and 1.3 ppbv for the methyl radical, is obtained. The performance and suitability of the setup are illustrated by the study of the chlorine-initiated oxidation reaction of toluene in the atmospheric simulation chamber and in the fast flow tube. Stable products and reactive intermediates have been well-determined and their reaction dynamics are discussed.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Non spécifiée

Établissement(s) :

Université de Lille
CNRS

Collections :

• Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522

Équipe(s) de recherche :

PhysicoChimie de l'Atmosphère (PCA)

Date de dépôt :

2020-10-07T13:58:03Z
2020-10-08T06:07:12Z