Simultaneous resolution of spectral and temporal properties of UV and visible fluorescence using single-photon counting with a position-sensitive detector

Journal Article · Wed Feb 01 00:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1145953· OSTI ID:6851488

Kelly, L A; Trunk, J G; Polewski, K; Sutherland, J C ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

A new fluorescence spectrometer has been assembled at the U9B beamline of the National Synchrotron Light Source to allow simultaneous multiwavelength and time-resolved fluorescence detection, as well as spatial imaging of the sample fluorescence. The spectrometer employs monochromatized, tunable UV and visible excitation light from a synchrotron bending magnet and an imaging spectrograph equipped with a single-photon sensitive emission detector. The detector is comprised of microchannel plates in series, with a resistive anode for encoding the position of the photon-derived current. The centroid position of the photon-induced electron cascade is derived in a position analyzer from the four signals measured at the corners of the resistive anode. Spectral information is obtained by dispersing the fluorescence spectrum across one dimension of the detector photocathode. Timing information is obtained by monitoring the voltage divider circuit at the last MCP detector. The signal from the MCP is used as a start'' signal to perform a time-correlated single photon counting experiment. The analog signal representing the position, and hence wavelength, is digitized concomitantly with the start/stop time difference and stored in the two-dimensional histogramming memory of a multiparameter analyzer.

• OSTI ID: 6851488
• Journal Information: Review of Scientific Instruments; (United States), Vol. 66:2; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
FLUORESCENCE SPECTROSCOPY
POSITION SENSITIVE DETECTORS
NSLS
COUNTING TECHNIQUES
TIME RESOLUTION
ULTRAVIOLET RADIATION
VISIBLE RADIATION
ACCELERATORS
CYCLIC ACCELERATORS
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
MEASURING INSTRUMENTS
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
RESOLUTION
SPECTROSCOPY
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
TIMING PROPERTIES
665100* - Nuclear Techniques in Condensed Matter Physics - (1992-)