Abstract
We have previously reported the results of electron beam-induced mass loss of L-phenylalanine at 7°K (1,2). We are currently in the process of measuring the mass loss as a function of temperature.As reported earlier, we found negligible mass loss at 7°K. Reference 2 discussed in detail the precautions to be taken to ensure that the measurements are meaningful. In the current series of measurements, the specimen thickness is measured directly as a function of dose rather than measuring the thickness of an irradiated area relative to a reference area. This is done by recording the energy loss spectrum in the range 0-150 Volts with a multichannel analyzer. The number of unscattered and inelastically scattered electrons are found by summing over the respective regions in the spectrum.Corrections have been made to take into account 1) inclusion of a finite range of energy loss in the spectrum; 2) geometric collection efficiency of the aperture in the spectrometer; and 3) effects due to multiple scattering.
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