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Enhancement of molecular modes by electronically resonant multipulse excitation: Further progress towards mode selective chemistry
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10.1063/1.2243273
/content/aip/journal/jcp/125/6/10.1063/1.2243273
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/6/10.1063/1.2243273
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Absorption spectrum of Nile Blue (LD 6900) in methanol (solid line) as well as spectra of the excitation pulse (dashed).

Image of FIG. 2.
FIG. 2.

Typical transient measured with Fourier-limited excitation at central wavelength and probed at . Insets: Signal (gray line), after subtraction of the slowly decaying background, fitted (dark line) with a sum of damped sine waves with 4 frequencies (330, 550, 600, and ). The strongest vibrational mode at decays with a time constant of about . The two insets taken at early and late delay times illustrate the damping of the molecular vibrations.

Image of FIG. 3.
FIG. 3.

Transients (A to C) and the respective Fourier spectra (D to F) at probed wavelength after excitation at . The transferred population (B) as well as the amplitude of the induced oscillation (E) are optimized when excited by a pulse train (subpulse spacing ) compared to a Fourier-limited pulse of equal energy ((A) and (D), respectively. Note that the optimized pulse train for is mode selective. The mode near is suppressed for this particular multipulse. A transient after excitation with a pulse train out of phase with the mode is depicted in (C). This mode is completely suppressed in (F) while the transferred population remains unaffected (see level of dotted line in (A) to (C)).

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/content/aip/journal/jcp/125/6/10.1063/1.2243273
2006-08-08
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhancement of molecular modes by electronically resonant multipulse excitation: Further progress towards mode selective chemistry
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/6/10.1063/1.2243273
10.1063/1.2243273
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