Fig. 3
Mass spectra of NH3, HCOOH, and NH4 +HCOO−. Intensities are normalized to the most intense of the peaks for NH3 (m∕z = 17) and HCOOH (m∕z = 29). For NH4 +HCOO− the fragments corresponding to ammonia are normalized to the most intense of the peaks (m∕z = 17) and those from formic acid to the second most intense peak (m∕z = 46).
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