Femtosecond ultraviolet pulses generated using noncollinear optical parametric amplification and sum frequency mixing

Kummrow, A.; Wittmann, M.; Tschirschwitz, F.; Korn, G.; Nibbering, Erik T. J.

doi:10.1007/s003400000483

Cited by 23 publications

(8 citation statements)

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“…Electronic excitation was achieved with pulses (336 nm, 1.7 m̈J, 60 fs) generated by the sum frequency mixing of the fundamental of a standard 1 kHz amplified Ti:sapphire laser (Spitfire, Spectra Physics) and visible pulses generated by a noncollinear optical parametric amplifier 46 . After passing an optical delay line, the pump pulses were focused onto the sample with a beam diameter of approximately 300 m̈m.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast Protonation of Cyanate Anion in Aqueous Solution

Adamczyk¹,

Dreyer²,

Pines³

et al. 2009

Israel Journal of Chemistry

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We use femtosecond infrared spectroscopy to study the aqueous protonation dynamics of cyanate, OCN -, using a photoacid, 2-naphthol-6,8-disulfonate (2N-6,8S) excited by a 60-fs pulse tuned at 336 nm. The transient response in the spectral range of the cyano-stretching vibrational marker modes of cyanic acid, HOCN, and isocyanic acid, HNCO, reveals how much of both reaction products are formed at early delay times, and whether the on-contact reactive complex between 2N-6,8S and OCNhas a well-defined structure. Using the Szabo-Collins-Kimball approach to describe bimolecular reaction dynamics subject to the Debye-von Smoluchowski diffusional motions, an on-contact proton transfer reaction rate is derived that follows the correlation between free energy and reaction rates found for a large class of aqueous proton transfer of photoacid dissociation and photoacid-base neutralization reactions.

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Section: Methodsmentioning

confidence: 99%

Ultrafast Protonation of Cyanate Anion in Aqueous Solution

Adamczyk¹,

Dreyer²,

Pines³

et al. 2009

Israel Journal of Chemistry

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“…We excited a 100 mm thick jet or a home-built rotating sample cell consisting of 1 mm thick CaF 2 windows with a 100 mm thick teflon spacer containing the sample solutions with the second harmonic of a home built 1 kHz amplified Ti:sapphire laser system (wavelength 400 nm, pulse duration 55 fs, energy 3-7 mJ, spot diameter 200 mm) or with pulses centred at 350 nm (pulse duration 50 fs, energy 1-3 mJ, same spot diameter) generated by sum-frequency mixing of the fundamental with visible pulses obtained with a noncollinear parametric amplifier. [47] Tunable mid-infrared probe pulses of 100-150 fs duration were generated by difference frequency mixing of signal and idler pulses from a near-infrared optical parametric amplifier. [48] After spectral dispersion with a polychromator the probe pulses were detected by a multichannel detector for the mid-IR.…”

Section: Methodsmentioning

confidence: 99%

Solvent‐Dependent Photoacidity State of Pyranine Monitored by Transient Mid‐Infrared Spectroscopy

et al. 2005

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We investigate with femtosecond mid‐infrared spectroscopy the vibrational‐mode characteristics of the electronic states involved in the excited‐state dynamics of pyranine (HPTS) that ultimately lead to efficient proton (deuteron) transfer in H2O (D2O). We also study the methoxy derivative of pyranine (MPTS), which is similar in electronic structure but does not have the photoacidity property. We compare the observed vibrational band patterns of MPTS and HPTS after electronic excitation in the solvents: deuterated dimethylsulfoxide, deuterated methanol and H2O/D2O, from which we conclude that for MPTS and HPTS photoacids the first excited singlet state appears to have charge‐transfer (CT) properties in water within our time resolution (150 fs), whereas in aprotic dimethylsulfoxide the photoacid appears to be in a nonpolar electronic excited state, and in methanol (less polar and less acidic than water) the behaviour is intermediate between these two extremes. For the fingerprint vibrations we do not observe dynamics on a time scale of a few picoseconds, and with our results obtained on the OH stretching vibration we argue that the dynamic behaviour observed in previous UV/Vis pump–probe studies is likely to be related to solvation dynamics.

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“…They indeed generate tuneable pulses that can be finely varied over the entire visible region and straightforwardly extended into the UV by frequency doubling or upconverting with a powerful IR pulse. 18,19 These arrangements result in 30-50 fs pulses with typically 0.1-1 mJ energy and tuning from 250 to 350 nm. 20,21 Ultrafast transient absorption One of the first works where the NOPA's flexibility was exploited to investigate a chemical process was carried out by Schenkl et al in 2005.…”

Section: State Of the Art: Methodologiesmentioning

confidence: 99%

Ultrafast UV spectroscopy: from a local to a global view of dynamical processes in macromolecules

Cannizzo

2012

Phys. Chem. Chem. Phys.

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The aim of this Perspective article is to cover recent developments in the application of femtosecond UV spectroscopy to understand molecular dynamics, and outlining potential future directions in this area. With several examples from recent literature the added-value of these techniques and their capability to study in real time changes in structure, dynamics and electrostatic fields of macromolecules in a site-specific fashion, as well as to uncover concerted dynamics in biomolecules, will be shown and discussed. The emerging fields of UV pulse-shaping techniques and UV optical nonlinear spectroscopies will be discussed to outline their potential to generate a novel family of coherent nonlinear spectroscopies for spectroscopic and microscopic applications.

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Femtosecond ultraviolet pulses generated using noncollinear optical parametric amplification and sum frequency mixing

Cited by 23 publications

References 0 publications

Ultrafast Protonation of Cyanate Anion in Aqueous Solution

Ultrafast Protonation of Cyanate Anion in Aqueous Solution

Solvent‐Dependent Photoacidity State of Pyranine Monitored by Transient Mid‐Infrared Spectroscopy

Ultrafast UV spectroscopy: from a local to a global view of dynamical processes in macromolecules

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