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Velocity map imaging spectrometer with an electric-field-matched gas capillary.

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Title: Velocity map imaging spectrometer with an electric-field-matched gas capillary.
Authors: Ranke, M1,2 (AUTHOR), Walther, S1 (AUTHOR) ulrike.fruehling@desy.de, Gebert, T3 (AUTHOR), Dimitriou, A1 (AUTHOR), Sumfleth, M (AUTHOR), Prandolini, M J (AUTHOR), Wieland, M (AUTHOR), Drescher, M (AUTHOR), Frühling, U1,4 (AUTHOR)
Source: Measurement Science & Technology. Sep2021, Vol. 32 Issue 9, p1-6. 6p.
Subjects: Spectrometers, Multiphoton ionization, Electrostatic fields, Crystal glass, Map design
Abstract: The design of a velocity map imaging (VMI) spectrometer is presented with a novel gas capillary integrated into the repeller electrode. The capillary is made of semiconductive lead glass, which replicates the electrostatic field of the VMI lenses. Thus, the target gas can be directly supplied to the interaction zone without degrading the VMI resolution. With this design, a high gas density and a large free aperture to focus long wavelength radiation into the VMI spectrometer have been achieved, which facilitates time resolved experiments with intense terahertz (THz)-light fields. The performance of the VMI spectrometer is demonstrated with momentum maps of electrons from multiphoton ionization of xenon and a first extreme ultraviolet-THz-streak experiment. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The design of a velocity map imaging (VMI) spectrometer is presented with a novel gas capillary integrated into the repeller electrode. The capillary is made of semiconductive lead glass, which replicates the electrostatic field of the VMI lenses. Thus, the target gas can be directly supplied to the interaction zone without degrading the VMI resolution. With this design, a high gas density and a large free aperture to focus long wavelength radiation into the VMI spectrometer have been achieved, which facilitates time resolved experiments with intense terahertz (THz)-light fields. The performance of the VMI spectrometer is demonstrated with momentum maps of electrons from multiphoton ionization of xenon and a first extreme ultraviolet-THz-streak experiment. [ABSTRACT FROM AUTHOR]
ISSN:09570233
DOI:10.1088/1361-6501/abeddc