The electron impact cross sections are reported for tetramethylsilane from the ionization threshold up to 5000 eV. The partial ionization cross sections (PICS) of the fragments created by ionization are obtained using a modified form of the binary-encounter Bethe (BEB) model. These fragments have a mass to charge ratio (m/z) ranging from 15 to 88. In the modified-BEB approach, the binding energy of each molecular fragment is increased in such a way that the last occupied orbital reflects the appearance potential of a particular fragment. The total ionization cross sections obtained after summing the PICS are in very good agreement with the experimental results. Additionally, the cross sections such as differential, integral and momentum transfer are also reported. These are computed within the local potential approximation and invoking single centre expansion formalism. The total cross sections are obtained by incoherently summing the elastic and inelastic cross sections. The present scattering results are in excellent agreement with the experimental measurements. The modified-BEB model will be an immense help in understanding the effect of ionization on fragments.

Milk adulteration is a serious problem that threatens public safety in today's world. Various chemical reactions can be used to detect adulterants on a qualitative level but they are often tedious and expensive. The quantitative overview of milk adulterants can, on the other hand, be easily effected using surface plasmon resonance (SPR), a very sensitive optical tool used for investigating surface interactions. Economic and chemical adulterants (water, urea, and H 2 O 2 ) in milk specimens can be detected using the SPR optical sensor at even parts per million levels. The optical and dielectric properties of milk samples are also knownd for various adulterants. For sensing different concentrations of H 2 O 2 the sensitivity of an SPR-based optical sensor is 0.145°/(mg ml −1 ). The obtained results in the present work clearly show the possible application of the SPR technique as a sensor for the detection of adulterants in milk using prism/Au/sample system.

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