A molecular beam time‐of‐flight mass spectrometer using low‐energy‐electron impact ionization

Autor:	S. M. Penn, C. C. Hayden, F. Fleming Crim, K. J. Carlson Muyskens
Rok vydání:	1990
Předmět:	Time of flight Impact ionization Chemical ionization Materials science Ionization Photoionization Atomic physics Mass spectrometry Instrumentation Molecular beam Electron ionization
Zdroj:	Review of Scientific Instruments. 61:775-782
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1141493
Popis:	We have constructed a versatile apparatus to study photoinitiated processes in molecular beams using a variety of generally applicable techniques. The instrument contains a pulsed, low‐energy electron gun that delivers space‐charge‐limited electron beams into the ionization region of a time‐of‐flight mass spectrometer. The electron energy is tunable from 8 to 200 eV, and the electron energy distribution is relatively narrow (FWHM ∼0.3 eV), which allows us to ionize laser‐excited species and their decomposition products selectively. We have used low‐energy electron impact ionization and mass spectrometry to characterize molecular beams, to detect vibrationally excited molecules prepared by vibrational overtone excitation, and to detect primary photodissociation products in the presence of precursor molecules.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::61e5cebad8d826872f9ec55655ee9fcb https://doi.org/10.1063/1.1141493 Zobrazit plný text záznamu