Fig. 4: Ion counts as a function of the photon fluence ϕ: | Nature Communications

Fig. 4: Ion counts as a function of the photon fluence ϕ:

From: Matter-wave interference of a native polypeptide

Fig. 4

The error bars represent the standard deviation of the count rate, assuming Poissonian statistics. The ionization cross section σ(λL) can be extracted according to Eq. (5). The single exponential increase in the range of available laser intensities is compatible with a single-photon process.

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