title: Concentration-modulated absorption spectroscopy.
abstract: Concentration modulation is demonstrated to be a technique capable of markedly extending sensitivity limits in absorption spectroscopy. The gain generated relates in such a manner to sample transmittance that for the first reported time direct spectroscopic concentration measurements become possible. When concentration modulation is used with picosecond lasers, state lifetimes can be determined to a limit of approximately 20 psec.
authors.affiliation: Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth SY23 1NE, Dyfed, UK.
authors.forename: A J
authors.initials: AJ
authors.lastname: Langley
authors.forename: R A
authors.initials: RA
authors.lastname: Beaman
authors.forename: J
authors.initials: J
authors.lastname: Baran
authors.forename: A N
authors.initials: AN
authors.lastname: Davies
authors.forename: W J
authors.initials: WJ
authors.lastname: Jones