Measuremenu are reponed of Auger (autoionization) spectra of AI and Kr produced by bombarding AI and Si substrates with Art and Kr* ions in the 110 eV-5 keV energy m g e . These are shown to be coflsistenl wilh the simple Doppler model suggested, for Ne on AI and Si, in a previous paper. Once corrected using the model, the observed Auger energies are shown to correspond lo lheoretical predictions produced using D-Fock calculations.

The Auger (autoionization) spectra produced by bombarding a magnesium target with argon and neon ions of energy in the range 200 eV-5 keV x e reported. The observed spectra of both gases contained considerable fine smctuce broadly similar to that observed in spectra from aluminium and silicon targets. The Mg spectra contained structure not previously reported, which could be indexed as pan of 3 series of transitions from M excited state in M i ' to states at and above the ground state in Mg+. The variation of the heights of the main peaks was examined as a funcdon of incident ion energy. The graph of peak height against incidence energy showed 3 sharp maximum for Ar while this was not the case for either Ne or Mg.The m e gas Auger peaks increased in energy with increasing incident ion energy and the shift could be explained in terms of a simple Doppler madel appropriate to the strongly fonvard scattered experimental conditions used here. No systematic vatiation in the energies of the Mg peaks was observed.

Abstract-Impacts of small particles of soda-lime glass and glycine onto low density aerogel are reported. The aerogel had a quality similar to the flight aerogels carried by the NASA Stardust mission that collected cometary dust during a flyby of comet 81P ⁄ Wild 2 in 2004. The types of track formed in the aerogel by the impacts of the soda-lime glass and glycine are shown to be different, both qualitatively and quantitatively. For example, the soda-lime glass tracks have a carrot-like appearance and are relatively long and slender (width to length ratio <0.11), whereas the glycine tracks consist of bulbous cavities (width to length ratio >0.26). In consequence, the glycine particles would be underestimated in diameter by a factor of 1.7-3.2, if the glycine tracks were analyzed using the soda-lime glass calibration and density. This implies that a single calibration for impacting particle size based on track properties, as previously used by Stardust to obtain cometary dust particle size, is inappropriate.

AbstracL Measurements are rrrpocied at the hger (autaimizatian) peer rum of tie produced b j bombarding Al and Si surfaces with Ne4 ions with energies in the range 4Nl eV lo 5 keV l l e shift in the Ne peak energies with incident ion energy is shown to follow a wry simple Doppler model. ?ne data are found 10 mntsin many mall Auger peab in nddition b the two characteristic peaks rearded ly prwious wakcrs. Ttis new sliuclun ir shown to t x mnsistent with gas-phase data and with measurements of the auloionhing mles m Ne I.