Abstract

The mass resolved (2+2) resonance enhanced multiphoton ionization (REMPI) spectra of methylamine (MA) via the (n N,3s) Rydberg state were obtained in the 430–485-nm region using a time-of-flight (TOF) mass spectrometer. They have the same vibrational structure mainly due to NH 2-wagging mode excitation. The parent ion relative intensity increases at longer wavelengths. The multiphoton ionization mechanism is discussed.

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