Laser Diagnostics for Gas Phase Reaction Kazuhiro Akihama, Shuichi Kubo, Satoshi Yamazaki (1) (2) (3) Two-level model. (4) (1) (2) (3) (1) (2) (3) (4) LIF LIF LIF 2 LIF 2 I A B A BQ ( ( ) ) c ( ) I FL * CARS DFWM
I FL = AB c (Q + A ) + 2BI N 0 I φ N0 N1 N2 ( N1 N21 2 ) φ ( ) N0 Q Q I BI c (Q A ) I FL (A 2)N0φ I A φ I FL 2 2 ( ) 4 LIF LIF LIF Q YAG 350 1000nm LIF ( ) ( ) LIF OH Bechtel Teets LIF OH OH 1 Fig.1 dn 1 / dt = (BI / c ) (N 2 N 1 ) + (Q + A ) N 2 dn 2 / dt = (BI / c ) (N 1 N 2 ) (Q + A ) N 2 dn 1 / dt = dn 2 / dt = 0 N 2 I FL = AN 2 φ (1) Generalized experimental schematic for LIF measurements.
CVD Si Si 2 SiH C 2 LIF Andresen LIF LIPF * Sanders Nd :YAG 4 ( 266nm ) CH 3 ONO hν CH 3 O NO CH 3 O LIF NO 18) LIF Okazaki NO2 ( ) OH 2 ( Two-line method ) Hydroxyl concentration for stoichiometric methane air flame vs. distance along gas flow. (8) Laser Induced Predissociative Fluorescence
2 2 2 LIF LIF LIF OH 2 ν ν R ν ν R ν ν R ν R ν R ν J ν J I R σ Ω N vj Iφ 2 σ Ω N vj I φ 1) (2) N vj ν ( ) The ln ( I /ν S J ) for the R 11 + Q 21 branches of the γ ( 0-0 ) band of the NO plotted against J " ( J "+ 1 ). Observations at three different temperatures are shown. I : the intensity of the lines, ν : excitation wave number, S J : the line strength, J" : rotational quantum number. Two-dimensional images of OH LIF. Reprinted with permission of the authors.
φ ( 10 4 ) Fig.2 LIF 4 YAG ( ) Ar + Bechtel CH 4 O 2 H 2 O CO 2 CO H 2 ( ) LIF 2 Concentration and temperature profiles of fuel-lean (φ = 0.86) atmospheric pressure, premixed, laminar CH 4 air flame. LIF Pb 1-x Sn x Te pn ( 3 30µm ) 1
100cm 1 100K ( 0.3mK ) 0.1mW ( 10 4 cm 1 ) 1 ( 1000 ) 2 ( HgCdTe InSb ) FM ( f ) 2 f ( 2 ) Zeeman Zeeman Zeeman Tunable diode laser spectrometer system
LIF SiH 3 SiH 3 k (ν ) SiH 3 CH 3 SiH 3 HO 2 Sugawara CO 2 SiH 3 O 2 SiH 3 ab initio CO Arnold CO 2 50µsec Fig.8 Observed line profiles of the R (4,0)(1-0 + ) and R (4,1) (1-0 + ) lines of SiH 3. All the R -branch transitions are split into two components by the spin-rotation interaction. The lower trace is the fringe pattern generated by an etalon with a free spectral range of about 0.01cm -1. 41) χ χ (2) χ (3) (3) χ (n) n 2 χ (2) 03 ( 3 )
3 3 2 CARS ( Coherent Anti-Stokes Raman Scattering ) DFWM ( Degenerate Four-Wave Mixing ) 2 ( ν P ν S ) ν P ν S ν R ν CARS 2ν P ν S ν P ν R 3 CARS 2 ν P ν S ( ) 3 3 CARS ν P ν S 10 5 ν P ν S CARS 2 P S CARS ν P ν S CARS Lucht CARS ( CARS ) CARS ` Experimental apparatus for the CARS measurements. 55) CL : Cylindrical lens P : Polarizer DC : Dye cell R : 1/2 waveplate L : Lens T : Telescope
SiH 4 SiH 4 Q DFWM 3 ( 2 ) LIF PUMP PUMP PROBE DFWM 2 DFWM ( ) DFWM 2 Ewart NaCl Na2 Fig.10 DFWM LIF OH DFWM 2 LIF 10 ( DFWM 10 ) LIPF DFWM ( DFWM ) Arrangement of the pump and probe beams for DFWM. 64) Intensity profile of a probe beam reflected from a planar section through a laminar flame recorded by a single laser shot. 64)
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