Copyright Resonance Ltd., December 2011 143 Ferndale Drive North, Barrie, ON L4N 9V9       Tel: 705-733-3633         Fax: 705-733-1388      Email:sales@resonance.on.ca 
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HHeLM-L   HHeLM-LOT   HHeLM-LOEM
The Hydrogen Light sources come standard with everything needed to produce VUV radiation in the 110 to 200 nm region. A heater on the light source bulb generates H2 or  D2 in the light source. This allows the user to operate the light source at low H2 levels for an “optically thin” Lyman-Alpha line or a multiple-lined H2 spectrum in the 110 to  165 nm region and a continuum between 165 and 375 nm. 
Continuously variable heater temperature setting that allows: 
 “Optically thin” source of Lyman-Alpha radiation (121.6 nm) or with heater adjustment a broadband VUV UV light source with output from 112 to 400 NM. 
Hydrogen spectral output from 112 to 6000 NM. 
Air-cooled, optically stable (Typically < 1% drift per hour) 
Longer lifetime than most available Lyman-Alpha sources owing to an internal source of hydrogen 
Breakout box for RS-232 telemetry, BNC modulation input (if equipped), power switch, and USB interface for interface software (see software manual) 
“Smart Light Source” software allows for precise control and monitoring of light source parameters (heater, RF power etc.)
 - Visible NIR source emission intensity graphing and logging for tracking source stability. 
 - Temperature and RF power logging and graphing via graphical chart-recorder interface 
 - Excel-friendly .csv output format for data saving
Configurations 
HHeLM-L, HHeLM-LOT  are physically identical but have bulbs selected for high Lyman Alpha output which is verified by taking VUV spectra.  They are delivered with the  heater setting optimized for lyman alpha output.   The HHeLM-LOT are additionally verified to have an “optically thin” Lyman alpha line by measurement of the absorption of  the VUV emission by atomic hydrogen. 
The HHeCM-L and HHeCW-L light sources have the same physical configurations as the HHeLM series except for the lamp bulbs.  Lamp bulbs in these lamps are configured for concentration of the plasma along the bulb axis.  This allows operation at higher H2 pressures which increases optical power the 110 to 165 nm H2 molecular and the 165 to 400 nm H2 continuum spectra.  The HHeCM-L bulbs are optimized for flood applications while the HHeCW-L bulbs are optimized for coupling to wavelength filtering devices such as monochromators.