Table 1.

The conditions of GED/MS experiment.

nozzle-to-plate distance, mm	338	598
fast electron beam, μA	1.47	0.64
temperature of effusion cell, K	431(5)	401(5)
accelerating voltage, kV	79.2	79.5
(electron wavelength), Ǻ	0.04200(3)	0.04192(4)
ionization voltage, V	50(1)	50(1)
exposure time, s	130–140	50–60
residual gas pressure, Torr	1.0⋅10−6	2.5·10−6
s-values range, Å−1a	2.5–23.9	1.3–16.1

^as = (4π/λ)sinθ/2, λ is electron wavelength and θ is scattering angle.