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We formulate a transparent measure that quantifies chirality in singleelectron ionization triggered in atoms, which are achiral systems. We do so inthe context of Ar driven by a new type of optical fields that consists of twonon-collinear laser beams giving rise to chirality that varies in space acrossthe focus of the beams. Our computations account for realistic experimentalconditions. To define this measure of chirality, we first find the sign of theelectron final momentum scalar triple product $\mathrm{{\bf{p}}_{k}\cdot({\bf{p}}_{i}\times {\bf p}_{j})}$ and multiply it with the probability for anelectron to ionize with certain values for both $\mathrm{p_{k}}$ and$\mathrm{p_{i}p_{j}}$. Then, we integrate this product over all values of$\mathrm{p_{k}}$ and $\mathrm{p_{i}p_{j}}$. We show this to be a robust measureof chirality in electron ionization triggered by globally chiral electricfields.

Momentum scalar triple product as a measure of chirality in electron ionization dynamics of strongly-driven atoms