Laser excitation spectrum of the

Fig. 5. High resolution laser excitation spectrum of the 0—0 band in the A2E—X n system of the OH radical. The widths of the peaks in the spectrum reflect the Doppler width of OH at room temperature, Ay 8 = 0.009 A. (After ref. 35.)...

Figure 16. Laser excitation spectrum of the 000-000 band of the B22 + -X2S+ transition of SrOD. [Reprinted with permisssion from ref. 74. Copyright 1996 Academic Press.]...

Figure 18. Laser excitation spectrum of the C2A-X21.+ transition of CaOH. [Reprinted with permission from ref. 85. Copyright 1992 American Institute of...

Figure 12 Laser excitation spectrum of the (6,0) band ofBrF,, at 0.01 nm laser bandwidth...

Fig. 10 Laser excitation spectrum of the vinoxy radical showing resolved rotational structure, with the assignments as indicated.

Fig. 11 Laser excitation spectrum of the ethoxy radical showing rotational structure with the indicated assignments.

Figure B2.3.15. Laser fluorescence excitation spectrum of the A S -X ff (1,3) band for the OH product, in the V = 3 vibrational level, from tire H + NO2 reaction [44]- (By pemrission from AIP.)...

Figure 4.14c demonstrates time-resolved luminescence spectra of caldte, Franklin, NJ, under 266 nm laser excitation. A very intensive UV band at 312 nm with a short decay time of 120 ns is detected. It may not be connected with Ce emission, because its spectrum is situated at a substantially longer wavelength near 400 nm (Fig. 4.14e). The excitation spectrum of the band at 312 nm consists of one band at 240 nm (Gaft et al. 2003a).

Figure 7.32 (a) Broadening of an electronic absorption band of a molecule due to an inhomogeneous environment (b) illustration of a laser-induced photochemical hole burned in the 0-0 A, line of free-base porphyrin in -octane at 2K (c) excitation spectrum of the 0-0 lines of the Sj-So transition of the free base in n-hexane, showing a frequency difference ( 100cm" ) between the two tautomeric forms (1) and (2) of the free base in a single type of site. Irradiation into the line A, transforms it into Aj and vice versa (d) hole burned in line A, at 4.2 K. (After Williams, 1983.)... 

In alkali atom experiments no explicit resonances have been observed in microwave ionization. However, there are indirect confirmations of the multiphoton resonance picture. First, according to the multiphoton picture the sidebands of the extreme n and n + 1 Stark levels should overlap if E = 1/3n5. In the laser excitation spectrum of Na Rydberg states from the 3p3/2 state in the presence of a 15 GHz microwave field van Linden van den Heuvell et al. observed sidebands spaced by 15.4 GHz, as shown in Fig. 10.15.18 The extent of the sidebands increases linearly with the microwave field, as shown in Fig. 10.15, and the n = 25 and n = 26 sidebands overlap at microwave fields of 150 V/cm or higher, matching the observation that the 25d state has an ionization threshold of 150 V/cm in a 15 GHz field. 

Figure 4-1. (a) Fluorescence excitation spectrum of the Hg-H2 complex, (b) Action spectrum of the Hg-H2 complex the pump laser is varied while the probe laser sits on the band head of the 0-0 transition in Hg H(2n1/2 <- 2E+). In the 2=1 domain extending into the continuum seen in (a), one sees vibrational bands—the reaction is then slow for the fl = 0 excitation (in the red), no structure appears—indicating a fast reaction. 

Figure 19. The laser-induced fluorescence excitation spectrum of the Ct swan band system in an acetylene-air flame (21)...

A different perspective of the vibrational structure of the Sj electronic state is illustrated in Figure 2.13b. This is an OODR that was obtained by sequentially exciting CI2CS with two photons of different colors. In this experiment, a photon from the first laser (the pump photon) induces a Si <— So vibronic transition that is followed after a short time delay by a second S2 Si, probe photon that carries the excitation to the S2 state. The pump laser is advanced to the blue and interrogates the bands of the S2 <— So system while the probe laser is scanned at the same rate to the red such that the total energy matches a selected vibrational level of the S2 state. In this way, an excitation spectrum of the vibrational band structure of the S2 state is constructed by monitoring the fluorescence that originates from the S2 state. 

Fluorescence lifetimes of the first excited singlet states of HSO and DSO. Analytical expression used to compute vibrational energy dependence of non-radiative rates Dye-laser excitation spectrum of A A (004) — X A (000) band of HSO... 

Simulation of the i.r. spectrum of ArHD from an accurate calculation of photodissociation cross-sections. Comparison with experiment Laser excitation spectrum of NaArjA H —... 

Figure B2.3.11. (a) Experimental laser fluorescence excitation spectrum of the A Tl (0,0) band for the...

Fig. 13. (a) Absorption spectrum and (b) photon-echo excitation spectrum of the origin of the electronic transition of pyrene in biphenyl at 2 K. The laser bandwidth in... 

The laser excitation spectrum of IF is simple, each band consisting of a / and R branch uncomplicated by isotopic splittings. Eight bands of the v = 0 progression (3 > v > 10) have been observed in laser excitation of the B—system. ... 

A predissociation was observed, as can clearly be seen in Figure 11, which shows the laser excitation spectrum recorded at both low resolution ( 0.01 nm) and high resolution ( 0.001 nm). Onset of breaking-off in fluorescence in the 10—0 band is observed at J 12, indicating that predissociation of the B state commences at an energy of (22 700 15) cm above " = 0 of the ground state. (Predissociation has been observed in laser excitation studies of the interhalogens IF, BrF, and ICl, and it will be discussed for each in turn.)... 

Laser-MS has also been used to resolve optical spectra of naturally occurring isotopic species. In this application, a peak in the MS due to an ion containing the isotope of interest (e.g. C-13 in benzene [25] or other molecules [26]) is selected. The intensity of the mass peak is then monitored as a function of the laser, producing the excitation spectrum of the isotopically labeled molecule. 

Particularly for polyatomic molecules with their complex visible absorption spectra, the reduction of the Doppler width is essential for the resolution of single lines [392]. This is illustrated by a section from the excitation spectrum of the SO2 molecule, excited with a single-mode frequency-doubled dye laser tunable around X = 304 nm (Fig. 4.4b). For comparison the same section of the spectrum as obtained with Doppler-limited laser spectroscopy in an SO2 cell is shown in Fig. 4.4a [391]. 

The simplest energy transfer upconversion (ETU) involves a cross-relaxation process between two ions. The processes ESA and ETU can be distinguished by energy dependence measurements, such as by recording the excitation spectrum of the luminescent state. For example, the mechanism of upconversion luminescence of Tm " in TmP50i4 was investigated by Chen et al. [128]. Pumping the p2 multiplet (15,153 cm ) by a 659 nm laser was observed to lead the luminescence D2 p4 at 450 nm. The intensity of the D2 emission, 7em, varied as ... 

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