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Laser probe schematic

Figure 2. Schematic depiction of physical processes affecting the laser probe beam for an opaque homogeneous sample including thermoelastic deformation of the air-sample interface and thermal lens effects in the air above the sample. Figure 2. Schematic depiction of physical processes affecting the laser probe beam for an opaque homogeneous sample including thermoelastic deformation of the air-sample interface and thermal lens effects in the air above the sample.
A schematic diagram of the CO laser-probing apparatus is shown in Fig. [Pg.86]

Fig. 1. Schematic diagram of the CO laser probing apparatus. PZT, piezoelectric transducer attached to a 3% transmitting, 3-m radius coupling mirror. Fig. 1. Schematic diagram of the CO laser probing apparatus. PZT, piezoelectric transducer attached to a 3% transmitting, 3-m radius coupling mirror.
Figure 10.2 Time-resolved spectroscopy involving pump probe lasers, (a) Schematic of the experimental setup. The pump laser irradiates the sample with a fixed beam path. The timing of the probe laser is controlled by using a moveable mirror (mirrors I and II) system, (b) The pump laser excites molecules from the 5 state to the 5, state, and the probe laser excites the molecule from the 5 state to the ionization continuum. Molecules in the 5, state can undergo relaxation back to the 5n state... Figure 10.2 Time-resolved spectroscopy involving pump probe lasers, (a) Schematic of the experimental setup. The pump laser irradiates the sample with a fixed beam path. The timing of the probe laser is controlled by using a moveable mirror (mirrors I and II) system, (b) The pump laser excites molecules from the 5 state to the 5, state, and the probe laser excites the molecule from the 5 state to the ionization continuum. Molecules in the 5, state can undergo relaxation back to the 5n state...
Fig. 2.1. Schematic illustration of the transient two-photon ionization (TPI) process of a molecule. Starting initially from the neutral molecules s ground state, a wave packet is generated in one of the molecule s excited electronic states by an ultra-short (pump) pulse. The prepared wave packet propagates on this PES, and after a certain delay time At a second laser (probe) pulse is applied to ionize the molecule... Fig. 2.1. Schematic illustration of the transient two-photon ionization (TPI) process of a molecule. Starting initially from the neutral molecules s ground state, a wave packet is generated in one of the molecule s excited electronic states by an ultra-short (pump) pulse. The prepared wave packet propagates on this PES, and after a certain delay time At a second laser (probe) pulse is applied to ionize the molecule...
Figure B2.5.8. Schematic representation of laser-flash photolysis using the pump-probe technique. The beam splitter BS splits the pulse coming from the laser into a pump and a probe pulse. The pump pulse initiates a reaction in the sample, while the probe beam is diverted by several mirrors M tluough a variable delay line. Figure B2.5.8. Schematic representation of laser-flash photolysis using the pump-probe technique. The beam splitter BS splits the pulse coming from the laser into a pump and a probe pulse. The pump pulse initiates a reaction in the sample, while the probe beam is diverted by several mirrors M tluough a variable delay line.
Figure C3.3.4 shows a schematic diagram of an apparatus tliat can be used to study collisions of tlie type described above [5, 9,12,16]. Donor molecules in a 3 m long collision cell (a cylindrical tube) are excited along tlie axis of tlie cell by a short-pulse excimer laser (typically 25 ns pulse widtli operating at 248 mil), and batli molecules are probed along tliis same axis by an infrared diode laser (wavelengtli in tlie mid-infrared witli continuous light-output... Figure C3.3.4 shows a schematic diagram of an apparatus tliat can be used to study collisions of tlie type described above [5, 9,12,16]. Donor molecules in a 3 m long collision cell (a cylindrical tube) are excited along tlie axis of tlie cell by a short-pulse excimer laser (typically 25 ns pulse widtli operating at 248 mil), and batli molecules are probed along tliis same axis by an infrared diode laser (wavelengtli in tlie mid-infrared witli continuous light-output...
Schematic diagrams of modem experimental apparatus used for IR pump-probe by Payer and co-workers [50] and for IR-Raman experiments by Dlott and co-workers [39] are shown in figure C3.5.3. Ultrafast mid-IR pulse generation by optical parametric amplification (OPA) [71] will not discussed here. Single-colour IR pump-probe or vibrational echo experiments have been perfonned with OP As or free-electron lasers. Free-electron lasers use... Schematic diagrams of modem experimental apparatus used for IR pump-probe by Payer and co-workers [50] and for IR-Raman experiments by Dlott and co-workers [39] are shown in figure C3.5.3. Ultrafast mid-IR pulse generation by optical parametric amplification (OPA) [71] will not discussed here. Single-colour IR pump-probe or vibrational echo experiments have been perfonned with OP As or free-electron lasers. Free-electron lasers use...
The apparatus consists of a pulsed molecular beam, a pulsed ultraviolet (UV) photolysis laser beam, a pulsed vacuum ultraviolet (VUV) probe laser beam, a mass spectrometer, and a two-dimensional ion detector. The schematic diagram is shown in Fig. 1. [Pg.167]

Once specific absorption features are assigned, kinetic studies can be performed via tuning the probe laser to a frequency absorbed by the fragment whose reaction kinetics are of interest. Ideally, it is also desirable to measure the rate of formation of the reaction product and to verify that these two rates correlate with each other. This has been done for the Fe(C0)x system with added CO where the reaction can be schematically depicted as... [Pg.89]

Fig. 2.6. Schematic illustration of the experimental setup for pump-probe anisotropic reflectivity measurements with fast scan method. PBS denotes polarizing beam splitter, PD1 and PD2, a pair of matched photodiodes to detect p- and s-polarized components of the reflected probe beam, PD3 another photodiode to detect the interference pattern of He-Ne laser in a Michelson interferometer to calibrate the scanning of the pump path length... Fig. 2.6. Schematic illustration of the experimental setup for pump-probe anisotropic reflectivity measurements with fast scan method. PBS denotes polarizing beam splitter, PD1 and PD2, a pair of matched photodiodes to detect p- and s-polarized components of the reflected probe beam, PD3 another photodiode to detect the interference pattern of He-Ne laser in a Michelson interferometer to calibrate the scanning of the pump path length...
The object was an auto exhaust catalyst, a monolith cylinder 25 mm in length and 38 mm in diameter. The outside wall was broken away so that one of the 1 ram-wide channels became accessible to the IR and probe laser beams, and a portion of one channel was studied in the manner shown schematically in the insert of Fig. 8. The sample was examined in air, because a cell large enough to contain the monolith was not available. The spectrum shows the features of cordierite [20], the material from which honeycomb monoliths are usually made, a broad absorption in... [Pg.410]

An NIR biosensor coupled with an NIR fluorescent sandwich immunoassay has been developed. 109 The capture antibody was immobilized on the distal end of an optical fiber sensor. The probe was incubated in the corresponding antigen with consecutive incubation in an NIR-labeled sandwich antibody. The resulting NIR-labeled antibody sandwich was excited with the NIR beam of a laser diode, and a fluorescent signal that was directly proportional to the bound antigen was emitted. The sensitivity of the technique increased with increasing amounts of immobilized receptor. There are several factors involved in the preparation of the sandwich type biosensor. A schematic preparation of the sandwich optical fiber is shown in Figure 7.14. [Pg.213]

Figure 11.15. Schematics of the optical arrangement and temperature probes for the Cr+ fluorescence lifetime-based fiber optic thermometers. F = short-pass optical filter Fa = bandpass or long-pass optical filter LD = laser diode LED = light emitting diode S = the fluorescence material used as sensing element vm = signal to modulate the output intensity of the excitation light source v/= the detected fluorescence response from the sensing element. Figure 11.15. Schematics of the optical arrangement and temperature probes for the Cr+ fluorescence lifetime-based fiber optic thermometers. F = short-pass optical filter Fa = bandpass or long-pass optical filter LD = laser diode LED = light emitting diode S = the fluorescence material used as sensing element vm = signal to modulate the output intensity of the excitation light source v/= the detected fluorescence response from the sensing element.
Figure 19.1. Schematic diagram of a general pump-probe-detect laser spectrometer suitable for picosecond electronic absorption, infrared (IR) absorption, Raman, optical calorimetry, and dichroism measurements. For picosecond fluorescence—a pump-detect method, no probe pulse needs to be generated. Figure 19.1. Schematic diagram of a general pump-probe-detect laser spectrometer suitable for picosecond electronic absorption, infrared (IR) absorption, Raman, optical calorimetry, and dichroism measurements. For picosecond fluorescence—a pump-detect method, no probe pulse needs to be generated.
Fig. 3.13 Schematic of an imaging atom-probe which uses the pulsed-laser... Fig. 3.13 Schematic of an imaging atom-probe which uses the pulsed-laser...
Fig. 3.17 Schematic of the Penn State high resolution pulsed-laser ToF atom-probe. The flight path length of this system is now —778 cm. It uses two LeCroy 4204 TDCs of 156 ps time resolution for flight time measurement. Fig. 3.17 Schematic of the Penn State high resolution pulsed-laser ToF atom-probe. The flight path length of this system is now —778 cm. It uses two LeCroy 4204 TDCs of 156 ps time resolution for flight time measurement.
Fig. 2. Pump and probe scheme within a tiers picture (schematic). The zeroth order bright state which is not Franck-Condon (FC) active in the electronic transition is excited via the near IR- laser pulse. FC-active modes m later tiers having no population at t=0 are probed and their time dependent population is a measure for IVR (Vj being matrix elements connecting zeroth order states) in the molecule giving rise to an enhancement of the electronic absorption. Fig. 2. Pump and probe scheme within a tiers picture (schematic). The zeroth order bright state which is not Franck-Condon (FC) active in the electronic transition is excited via the near IR- laser pulse. FC-active modes m later tiers having no population at t=0 are probed and their time dependent population is a measure for IVR (Vj being matrix elements connecting zeroth order states) in the molecule giving rise to an enhancement of the electronic absorption.

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See also in sourсe #XX -- [ Pg.141 , Pg.142 ]




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