Concentration-modulated absorption spectroscopy.
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.
Langley
A J
AJ
Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth SY23 1NE, Dyfed, UK.
Beaman
R A
RA
Baran
J
J
Davies
A N
AN
Jones
W J
WJ