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Flow Lamps

 

General Information

 

 

 The Resonance Flow Lamp system can be configured as a windowless source of EUV emissions or with interchangeable LiF or MgF2 windows. With the interchangeable window the system can be used to produce emissions above the LiF cutoff of 104 nm. This system is the same as the EUV windowless source except that the gas flowing through the lamp does not flow into a differential.

 

The Resonance EUV windowless source is an RF excited flow lamp with a capillary bore in an EMI shielded enclosure. This lamp mounts to a 33.78 mm or larger CF type flange.

The lamp assembly has an integral RF exciter which is powered by a small wall plug power supply. This supply is sufficient to produce emissions from the principal neutral rare gas species in the range of 10^15 photons per second per steradian.

Differential pumping can take place through a VUV monochromator or spectrometer. For broad band emission, the monochromator is set on zero order. In this mode all the spectral emissions from the lamp pass through the exit slit of the monochromator. Additionally the monochromator can be set at any wavelength in the 25 to 10,000 nm region. In this mode the monochromator acts as a spectral filter giving monochromatic output.

How is a Flow Lamp Different from an Ordinary Light Source?

A flow lamp does not have a window and thus can produce lines at wavelengths shorter than the cutoff of Lithium Fluoride (wavelengths <104nm).  A glass tube passes through a coil which is excited by an RF generator running at ~100 MHz.  The glass tube and RF generator are contained in a metal box with RF isolating feed-through capacitors. 

 

Specifications:

Configuration (drawing)

Major Spectral outputs (nm):

  • He: 58.4334
  • Ne: 73.5895 and 74.3718
  • Ar: 104.8219 and 106.6659
  • H: 121.57 and 102.572
  • O: 130.22, 130.48 and 130.61
  • N: 120
  • Cl: 118
  • N2: LBH bands
  • H2: numerous lines in 80 to 200 nm region

Vacuum:

  • Vacuum pressure should be <1 mTorr for rare gasses and 10-5 Torr when using exciting air
  • The gas load in a spectrometer while using the flow lamp should be 1 to 500 sccm without differential pumping or 0.001 to 0.5 sccm with differential pumping

Power:

  • 20 watt RF supply. Integral to capillary bore housing.
  • Power in (to wall plug unit)
  • 110 to 240 volts
  • 0.5 amps at 110 volts maximum

Mass:

  • Source head : 800 g
  • Power supply : 400 g

Vacuum adapter: 57.15 mm CF flange at output to differential pump assembly.

 

 

 

Click HERE to see a complete Flow Lamp System

Intensities:

  • greater than 10^15 photon/sec/str at lamp for major spectral lines
  • Typically 1010 photon/sec/sr at output of differentially pumped monochromator in EUV

 
 

 

 

Copyright Resonance Ltd., February 2006
143 Ferndale Drive North, Barrie, ON L4N 9V9      Tel: 705-733-3633      Fax: 705-733-1388       Email: res@resonance.on.ca