Channeling of vacuum ultraviolet radiation down tapered capillaries and prospects for a photoemission spectromicroscopy

Smith, N. V.; Royer, W. A.; Rowe, J. E.
June 1994
Review of Scientific Instruments;Jun94, Vol. 65 Issue 6, p1954
Academic Journal
The transmission of linear tapered silica-glass capillaries is calculated both numerically and analytically for photon energies in the vacuum-ultraviolet region (10-200 eV). The channeling factor C (ratio of transmitted to line-of-sight flux) is given to a good approximation by 2γ/β, where β is the taper angle and γ is a characteristic decay angle determined entirely by the optical constants. The angular divergence (FWHM) of the output flux is 2.4 (βγ)½, and the useful length of the capillary is 2dγβ[sup -3/2], where d is the diameter of the exit aperture. Experimental measurements of photoemission spectra on Au samples using tapered capillaries attached to the end of a conventional resonance lamp confirm these expectations. Channeling factors greater than 10³ should be achievable with submicron values of d.


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