Far ultraviolet detector standards

Canfield, L. R.; Swanson, N.

doi:10.6028/jres.092.011

Cited by 39 publications

(9 citation statements)

References 8 publications

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“…In lieu of direct calibration, instruments are usually calibrated by comparison with secondary (or tertiary) quantum efficiency standards such as photodiodes. Secondary standard photodiodes are typically calibrated by NIST at fixed wavelengths using the continuous spectrum produced by SURF and a double monochromator (the details vary with wavelength; see Canfield & Swanson 1987). A user's photodiode is then calibrated as a tertiary standard at fixed wavelengths by comparison with the secondary standard photodiodes.…”

Section: Methodsmentioning

confidence: 99%

Review of the ultraviolet flux calibration

Kruk

1997

Symp. - Int. Astron. Union

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The practical difficulties in performing laboratory calibrations of instruments at ultraviolet wavelengths are considerably greater than at visible wavelengths, and the concommitant uncertainties are greater as well. In recent years theoretical models of white dwarf atmospheres have been adopted as UV flux standards, with impressive results. In this review, I will discuss the methodology of laboratory flux calibrations in the UV, the internal consistency and potential shortcomings of calibrations based on white dwarf model atmospheres, recent laboratory results, and future prospects.

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Section: Methodsmentioning

confidence: 99%

Review of the ultraviolet flux calibration

Kruk

1997

Symp. - Int. Astron. Union

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“…We detect the XUV flux exiting the monochromator and delivered to the sample using four separate detectors: an aluminum coated silicon photodiode (PD, Optodiode AXUV100Al), the photocurrent from TM3, the photocurrent from the sample, and the photocurrent from an Al 2 O 3 vacuum photodiode 51 (VPD2) placed at the end of the surface science chamber. Figure 3(a) shows a typical HHG spectrum from xenon gas measured using each of the four detectors as the monochromator grating is rotated.…”

Section: Light Source and Beamlinementioning

confidence: 99%

Ultrafast extreme ultraviolet photoemission without space charge

Corder

Zhao

Bakalis

et al. 2018

Structural Dynamics

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Time- and Angle-resolved photoelectron spectroscopy from surfaces can be used to record the dynamics of electrons and holes in condensed matter on ultrafast time scales. However, ultrafast photoemission experiments using extreme-ultraviolet (XUV) light have previously been limited by either space-charge effects, low photon flux, or limited tuning range. In this article, we describe XUV photoelectron spectroscopy experiments with up to 5 nA of average sample current using a tunable cavity-enhanced high-harmonic source operating at 88 MHz repetition rate. The source delivers >1011 photons/s in isolated harmonics to the sample over a broad photon energy range from 18 to 37 eV with a spot size of 58 × 100 μm2. From photoelectron spectroscopy data, we place conservative upper limits on the XUV pulse duration and photon energy bandwidth of 93 fs and 65 meV, respectively. The high photocurrent, lack of strong space charge distortions of the photoelectron spectra, and excellent isolation of individual harmonic orders allow us to observe laser-induced modifications of the photoelectron spectra at the 10−4 level, enabling time-resolved XUV photoemission experiments in a qualitatively new regime.

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“…The National Institute of Standards and Technology ͑NIST͒ currently has two calibration facilities for ultraviolet ͑UV͒ detector spectral power responsivity measurement. One is the UV Spectral Comparator Facility ͑SCF͒ 1,2 in the Optical Technology Division and the other is the Far UV Calibration Facility [3][4][5][6][7] in the Electron and Optical Physics Division. The spectral responsivities of the SCF working standard detectors are derived from the High Accuracy Cryogenic Radiometer facility ͑HACR͒ 8,9 and extended to the UV range by comparison with a spectrally flat pyroelectric detector.…”

Section: Introductionmentioning

confidence: 99%

The new ultraviolet spectral responsivity scale based on cryogenic radiometry at Synchrotron Ultraviolet Radiation Facility III

Shaw

Larason

Gupta

et al. 2001

Review of Scientific Instruments

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The recently completed upgrade of the Synchrotron Ultraviolet Radiation Facility ͑SURF III͒ at the National Institute of Standards and Technology ͑NIST͒ has improved the accuracy of radiometric measurements over a broad spectral range from the infrared to the soft x ray. The beamline 4 at SURF III is a cryogenic-radiometer based radiometric facility for the ultraviolet ͑UV͒ spectral range. The upgrade of SURF III has allowed us to use beamline 4 to improve the detector spectral power responsivity scales in the wavelength range from 125 to 320 nm. The achieved combined relative standard uncertainty is better than 0.5% over most of this spectral range. This is a significant improvement over the more than 6% relative standard uncertainty in this spectral range of the current scales maintained at the Spectral Comparator Facility ͑SCF͒ in the Optical Technology Division and the Far UV Calibration Facility in the Electron and Optical Physics Division. The new UV scale of beamline 4 was subsequently intercompared and transferred to the SCF and to the Far UV Calibration Facility to improve their UV scales and ensure consistency within NIST. The new scale established at beamline 4 improves NIST's calibration capabilities for environmental monitoring, astrophysics, and the UV industry. The new scale also includes wavelengths such as 193 and 157 nm excimer laser wavelengths, which are of particular interest to the semiconductor photolithography industry.

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Far ultraviolet detector standards

Cited by 39 publications

References 8 publications

Review of the ultraviolet flux calibration

Review of the ultraviolet flux calibration

Ultrafast extreme ultraviolet photoemission without space charge

The new ultraviolet spectral responsivity scale based on cryogenic radiometry at Synchrotron Ultraviolet Radiation Facility III

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