title: Identification and imaging of OH (nu'' = O) and O(2) (nu'' = 6 or 7) in an automobile spark-ignition engine using a tunable KrF excimer laser.
abstract: Planar laser-induced predissociative fluorescence is applied to image state-specific densities of OH and hot O(2) inside an internal-combustion car engine. Improved instrumentation is described. It includes better imaging optics and a spectrometer that permits desired molecular quantum states to be selected and identified in real time. The OH (nu'' = 0) images are cleanly separated from the isooctane fuel and they display a thin superequilibrium region at the flame front. In contrast, vibrationally excited O(2) (nu'' = 6 or nu'' = 7) is uniformly distributed behind the front. Uneven and broken flame fronts are commonly observed.
authors.forename: P
authors.initials: P
authors.lastname: Andresen
authors.forename: H
authors.initials: H
authors.lastname: Schlüter
authors.forename: D
authors.initials: D
authors.lastname: Wolff
authors.forename: H
authors.initials: H
authors.lastname: Voges
authors.forename: A
authors.initials: A
authors.lastname: Koch
authors.forename: W
authors.initials: W
authors.lastname: Hentschel
authors.forename: W
authors.initials: W
authors.lastname: Oppermann
authors.forename: E
authors.initials: E
authors.lastname: Rothe