windowless hollow cathode lamp for vacuum ultraviolet ionized gas emission lines

Deep and Vacuum Ultraviolet Spectrophotometer

Do you test transmittance and reflectance in the Vacuum Ultraviolet? Do you provide optics, coatings, photo resist materials, and substrates for the energetic ultraviolet? The VUVAS 1000 directly measures reflectance and transmittance properties of vacuum ultraviolet (VUV) optical components. The VUVAS 1000 system works from 120 to 350 nanometers with high throughput, strong signal levels and excellent reliability. The system uses a high throughput vacuum monochromator, focused light source, a sample chamber capable of holding multiple samples, detectors, and an oil free vacuum pumping (or purge) system.
The VUVAS 1000 operates by first scanning and storing the source's output. A second scan is made with the sample optical component in the light path. The ratio of the stored scan vs. measurement scan yields the optics reflectance or transmittance properties as Percent. The same detector is used for both scans so the results are Absolute. Accurate measurement of optical properties can be made over a wide angular. Polarizer’s have been developed and are available for the system too.
The VUVaS 1000 comes complete with vacuum pump and gauge, or purge-gas system. Easy to use Spectrometer Control Software (LabView™ based) controls automated parameters and signal recovery.

VUVAS 1000 data sheet | Draft New VUVAS-1000 data sheet

Wavelength Range120 to 350nm
Vacuum CompatibleHigh vacuum, 10-5 mbar operation
N2 Purge SystemOptional
Precision, RSD (at 157nm) 0.25%
Precision, RSD (overall) <0.5%
Stability (per hour)1%
Bandpass (adjustable)1 to 8nm
Calibration accuracy0.1nm
Wavelength reproducibility0.05nm
Drive Step Size0.00006nm
Measurement BeamCollimated
Detector(s)Scintillated R6095
Detector positionvariable from ~10 to 180°
Sample positionvariable from zero to 60°
Qty samples3, 5 and other qtys avail. pls inquire
Polarizer MountingOptional
Beam Dia Scaling ApertureOptional

Here are example test results from a VUVAS 1000 system

windowless hollow cathode lamp for vacuum ultraviolet ionized gas emission lines windowless hollow cathode lamp for vacuum ultraviolet ionized gas emission lines

    The McPherson VUVaS can be equipped with windowless hollow cathode light source in order to reach deeper into the vacuum ultraviolet than the Deuterium source allows. Depending on the gas used, the hollow cathode lamp can work to wavelengths as low as 30nm. The EUV VUVAS is equipped with a grazing incidence off axis parabolic collimator optic to optimize light throughput in the wavelength region less than 110nm.

Some example / test spectra

This spectra was collected with the single beam VUVAS 1000 spectrophotometer system. Light source is deuterium and scans / data collection occur in 10E-5 mbar vacuum condition
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Select Publications

Abstract: Contactless measurements of water temperature are utilized in a number of sciences, such as oceanography, climatology, and biology. Previously reported Raman spectroscopy techniques exploited the changes in the shapes of water Raman bands. Interpretation of these changes is difficult since these bands are composed of multiple lines, each influenced not only by temperature but also by pressure and salinity. This paper presents a proof-of-principal demonstration of a contactless technique which determines water temperature from the ratio of Stokes and anti-Stokes intensities of the water 180 cm1 Raman band. This ratio is not sensitive to pressure and salinity, allowing reliable determination of water temperature.
S. P. Nikitin, C. Manka, J. Grun, and J. Bowles
Abstract: The luminous efficiency and lifetime of plasma display panels (PDPs) are directly related to the performance of phosphors used in PDPs, thus higher efficiency, higher stability against high temperature processes and a long lifetime along with good color chromaticity against vacuum-ultraviolet (VUV) radiation are major concerns in selecting suitable phosphors for PDPs. In the same pursuit, we have developed the nano-sized (15–40 nm) BAM:Eu2+, YAG:Tb3+ and YAG:Eu3+ as blue, green and red phosphors and studied their luminescence properties under VUV excitations. In BAM:Eu2+, the 5d-excitation of Eu2+ ions are found strongly dependent on the crystal field strength and Eu2+ occupy lattice ‘sites I’ by substituting Ba2+ ions. Whereas, in YAG:Tb3+, the observed green luminescence is assigned to 5D4?7Fj transitions (j = 3–6) due to electric dipole–dipole interaction, while, YAG:Eu3+ shows strong red luminescence corresponding to 5D0?7F2 transition. Time evolution studies along with decay time calculations are further employed to verify the sustainable emission without quenching.
Prashant K. Sharma, Ranu K. Dutta, Avinash C. Pandey
Abstract: Porous silicon samples have been prepared from p-type single-crystal silicon <100> by a galvanostatic and an open-circuit etch in 50% HF. The materials display bright red-orange room-temperature photoluminescence (PL) in air and toluene solution. Infrared measurements show that the porous silicon surface is partially oxidized. Exposure to anthracene (An) or 10-methylphenothiazine (MPTZ) results in dynamic quenching of the material's excited state(s). Nanosecond time-resolved PL decays are complex and wavelength dependent, with average lifetimes in neat toluene of 0.3-16 µs. Quenching by An and MPTZ is more efficient and rapid at short observation wavelengths. The steady-state and time-resolved quenching data are well fit to the Stern-Volmer model. The PL decays are well described by a skewed distribution of recombination rates.
Minh C. Ko and Gerald J. Meyer
Abstract: Discussed are the photoluminescence properties of combustion synthesized red and green emitting borate phosphors—YBO3 : Eu3+, BaZr(BO3)2 : Eu3+, YCaBO4 : Eu3+, YAl3(BO3)4 : Eu3+, YAl3(BO3)4 : Tb3+, LaBaB9O16 : Tb3+, LaBaB9O16 : (Ce3+,Tb3+), and Na3La2(BO3)3 : Tb3+-promising for use in plasma display panels and mercury-free fluorescent lamps.
P. A. Nagpure, S. K. Omanwar
Abstract: Coherent anti-Stokes Raman scattering (CARS) with femtosecond interaction pulses has become a popular and powerful spectroscopic method. Non-resonant background is one of the most limiting factors for implementing this method more widely. We propose a new approach that suppresses the non-resonant background contribution to the measured signal in CARS spectroscopy while simultaneously yielding high spectral resolution. The method is based on femtosecond pulse shaping of probe, Stokes and pump beams. Destructive interference suppresses the non-resonant background, resulting only in the resonant contribution being detected.
Stanislav O. Konorov, Michael W. Blades and Robin F. B. Turner
Abstract: We investigate the possibility of implementing coherent anti-Stokes Raman spectroscopy (CARS) with a single laser beam passed through a one-dimensional scattering object. The effect of the random scattering is emulated by shaping the laser pulses with a spectral mask corresponding to the transmission spectrum of a random layered medium. Raman resonances are retrieved through correlation analysis of the CARS spectrum. We study the effect of the scattering parameters on the resolution of the method, and show that improvement of the spectroscopic sensitivity can be achieved by compensating the phase distortions introduced by the scatterer
T.M. Drane, J.W. Hepburn and V. Milner

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