TABLE 3.

Terms for vibrational photodissociation spectroscopy of bare ions (see Table S3 for the complete list)

Name of a technique	Other terms used in literature
Isomer/conformer non‐selective techniques
Infrared multiple photon dissociation (IRMPD) spectroscopy	Infrared multiple photon dissociation (IRMPD) spectroscopy IRMPD action spectroscopy Gas‐phase IRMPD spectroscopy Resonant IRMPD (R‐IRMPD) spectroscopy Infrared multiphoton dissociation spectroscopy
Two‐color infrared multiple photon dissociation (IRMPD) spectroscopy	Resonance‐enhanced two‐laser IRMPD spectroscopy Two‐color IR dissociation spectroscopy Two‐laser photodissociation spectroscopy Infrared laser‐assisted photodissociation spectroscopy (IRLAPS) Two‐laser infrared laser‐assisted photodissociation spectroscopy (IRLAPS)
Vibrational IR–UV gain photodissociation ion spectroscopy	IR–UV gain spectroscopy Conformer nonselective vibrational spectroscopy Gain spectroscopy Infrared fragment ion‐gain spectroscopy (IRFIGS) IR–UV photofragment spectroscopy
Isomer/conformer selective techniques
Vibrational IR–UV depletion photodissociation ion spectroscopy	IR–UV depletion spectroscopy Conformer‐selective IR–UV depletion spectroscopy Conformer‐selective IR–UV double‐resonance photofragment spectroscopy IR–UV double‐resonance spectroscopy Infrared fragment ion‐dip spectroscopy (IRFIDS)
Vibrational IR–UV population transfer photodissociation ion spectroscopy	IR‐induced population transfer spectroscopy IR population transfer spectroscopy
Vibrational IR–IR–UV hole‐burning photodissociation ion spectroscopy	IR–IR–UV hole‐burning spectroscopy IR–IR–UV hole‐burning vibrational spectroscopy IR–IR–UV hole‐burning photofragmentation spectroscopy Conformer‐selective IR cold ion spectroscopy (CIS)