Vacuum ultraviolet photon detector with improved resolution for inverse photoemission spectroscopy

Journal Article · Wed Jun 15 00:00:00 EDT 2005 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1928192· OSTI ID:20722889

Stiepel, R; Ostendorf, R; Benesch, C; Zacharias, H ^[1]

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1. Physikalisches Institut, Universitaet Muenster, D-48149 Muenster (Germany)

We have significantly improved the energy resolution of a vacuum ultraviolet isochromat spectrometer for inverse photoemission spectroscopy. The detector is based on a Geiger-Mueller counting tube with acetone as filling gas and a CaF{sub 2} entrance window working as an energy selective optical bandpass at a mean energy of 9.84 eV. Under this operating conditions the detector achieves an optical energy resolution of 320 meV (FWHM). By adding a gas chamber with two CaF{sub 2} windows at the entrance of the counting tube we are able to use absorption lines of oxygen and krypton to further enhance the optical resolution of the detector system. In the case of krypton the mean energy shifts to a somewhat lower value of 9.72 eV. The energy resolution improves to about 115 meV (FWHM), while the integrated sensitivity decreases to approximately 30%. Due to the ability to easily switch between high sensitivity and high resolution this new counting tube differs from other resolution-enhancing suggestions. Measurements on the prominent (n=1) image potential state on the Cu(111) surface indicate that the photon detector is no longer the major resolution limiting component in the spectrometer.

• OSTI ID: 20722889
• Journal Information: Review of Scientific Instruments, Vol. 76, Issue 6; Other Information: DOI: 10.1063/1.1928192; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
ACETONE
CALCIUM FLUORIDES
COUNTING TUBES
ENERGY RESOLUTION
EV RANGE 01-10
IMAGES
KRYPTON
MEV RANGE 100-1000
OXYGEN
PHOTODETECTORS
PHOTOEMISSION
PHOTONS
PHOTOTUBES
SENSITIVITY
SPECTROSCOPY
SURFACES
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTROMETERS