science-softCon uv/vis+ spectra data base;	www.uv-spectra.de; (C) science-softCon 2010

Substance: helium				Other Names:

Formula: He				CAS-No.: 7440-59-7


Study: euv absorption cross sections

                
Authors: Po Lee, G.L. Weissler

Title: Absorption Cross Section of Helium and Argon in the Extreme Ultraviolet

Journal/Source: Phys. Rev., 99, 540-542, (1955); DOI:10.1103/PhysRev.99.540


Data: (diagram, table, disk): 

Energy/Wavelength range: 24.0 - 100.0 nm

Resolution: 

Temperature: 

Temperature dependence:

Pressure:


Comments: For helium a sharp absorption edge was observed at 504.3 A. Near this edge the photoionization 
cross section at 495.7 A was found to be 6.95 × 10-18 cm2.

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