Discussion
Why is seventy electron volts used rather than a lower energy?
Answer: D
Above about fifty volts the ionisation efficiency and the fragmentation pattern both become insensitive to the exact energy, so spectra recorded anywhere in that region are comparable and can be matched against a library. Ionisation itself needs only ten volts or so. The molecular ion still forms, though weakly for some compounds. A standard chosen because the result stops depending on it is a good standard, and it is why libraries of hundreds of thousands of spectra are usable.
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