caa a22 4500 445370300 CHVBK 20180317142944.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s00340-011-4450-2 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4450-2 High-vacuum time-resolved laser-induced incandescence offlame-generated soot [Elektronische Daten] [J. Headrick, F. Goulay, P. Schrader, H. Michelsen] We have measured time-resolved laser-induced incandescence of flame-generated soot under high-vacuum conditions (4.1×10−6 mbar) at an excitation wavelength of 532 nm with laser fluences spanning 0.06-0.5 J/cm2. We generated soot in an ethylene/air diffusion flame, introduced it into the vacuum system with an aerodynamic lens, heated it using a pulsed laser with a spatially homogeneous and temporally smooth laser profile, and recorded LII temporal profiles at 685 nm. At low laser fluences LII signal decay rates are slow, and LII signals persist beyond the residence time of the soot particles in the detection region. At these fluences, the temporal maximum of the LII signal increases nearly linearly with increasing laser fluence until reaching a plateau at ∼0.18J/cm2. At higher fluences, the LII signal maximum is independent of laser fluence within experimental uncertainty. At these fluences, the LII signal decays rapidly during the laser pulse. The fluence dependence of the vacuum LII signal is qualitatively similar to that observed under similar laser conditions in an atmospheric flame but requires higher fluences (by ∼0.03J/cm2) for initiation. These data demonstrate the feasibility of recording vacuum LII temporal profiles of flame-generated soot under well-characterized conditions for model validation. Springer (outside the USA), 2011 Headrick J. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut Goulay F. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut Schrader P. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut Michelsen H. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut Applied Physics B Springer-Verlag 104/2(2011-08-01), 439-450 0946-2171 104:2<439 2011 104 340 https://doi.org/10.1007/s00340-011-4450-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4450-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Headrick J. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut NATIONALLICENCE 700 1- Goulay F. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut NATIONALLICENCE 700 1- Schrader P. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut NATIONALLICENCE 700 1- Michelsen H. Sandia National Laboratories, P.O. Box 969, MS 9055, 94551, Livermore, CA, USA aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/2(2011-08-01), 439-450 0946-2171 104:2<439 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer