Resonant vibrational dephasing investigated by high-precision femtosecond CARS

Fickenscher, M.; Purucker, H.-G.; Laubereau, A.

doi:10.1016/0009-2614(92)85389-r

Cited by 43 publications

(21 citation statements)

References 40 publications

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“…The resonant CARS signal decays in the finite dephasing time of the vibrational mode. The dephasing time is related to the width of spectral line of the corresponding Raman band and is typically several hundred femtoseconds (in solid) to a few picoseconds (in gas or liquid) [63] . Therefore, the NRB noise can be eliminated by introducing a suitable time delay between the pump/Stokes and probe pulses [64] .…”

Section: Time-resolved Cars Detectionmentioning

confidence: 99%

“…In the first phase, the inherent molecular vibration of active Raman mode is driven by simultaneous pump and Stokes pulses and is resonantly enhanced when Ω R =ω P -ω S . The amplitude of resonantly enhanced molecular vibration is [108] :…”

Section: Suppression Of Nrb Noise In Broadband Cars With Scmentioning

confidence: 99%

“…With the improvement of temporalspectral distribution of the SC, the simultaneously detectable spectral range of system can be further extended, which is called the ultra-broadband T-CARS and will be discussed in detail in the next section. [84,96] With a broadband T-CARS spectroscopy, we can obtain more specificities of the sample, not only the vibrational spectra reflecting the molecular structure and compositions, but also the dephasing time of various molecular vibrational modes reflecting the molecular responses to the external micro-environment, which are especially favorable for the study of the complicated interaction processes between molecules and their micro-environment such as solute-solvent interactions [108,109] , molecular dynamics [110][111][112][113][114] , supramolecular structures [115] and excess energy dissipations in the fields of biology, chemistry and material science [64,[116][117][118] .…”

Section: Suppression Of Nrb Noise In Broadband Cars With Scmentioning

confidence: 99%

See 2 more Smart Citations

Ultra-Broadband Time-Resolved Coherent Anti-Stokes Raman Scattering Spectroscopy and Microscopy with Photonic Crystal Fiber Generated Supercontinuum

Niu¹,

Yin²

2012

Photonic Crystals - Innovative Systems, Lasers and Waveguides

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Section: Time-resolved Cars Detectionmentioning

confidence: 99%

Section: Suppression Of Nrb Noise In Broadband Cars With Scmentioning

confidence: 99%

Section: Suppression Of Nrb Noise In Broadband Cars With Scmentioning

confidence: 99%

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Ultra-Broadband Time-Resolved Coherent Anti-Stokes Raman Scattering Spectroscopy and Microscopy with Photonic Crystal Fiber Generated Supercontinuum

Niu¹,

Yin²

2012

Photonic Crystals - Innovative Systems, Lasers and Waveguides

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“…A direct visualization of vibrational dephasing of a vibrational mode can essentially be achieved through time-resolved studies. 3,4 Time-resolved Raman studies again require a fairly isolated band for a precise dephasing study. In case there are other Raman bands close by, a complicated beat pattern due to interference between the Raman active modes results, which makes the analysis 5,6 quite involved and cumbersome.…”

Section: Introductionmentioning

confidence: 99%

Probing self‐associated structures of the solute molecule, acrylonitrile, the solvent molecule 2Cl‐phenol and their binary complexes via concentration‐dependent Raman study and DFT calculation

Srivastava

Ojha

Sinha

et al. 2006

J Raman Spectroscopy

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Raman study of C N-stretching mode of acrylonitrile and ring-breathing mode of 2Cl-phenol was made in the binary mixture of (acrylonitrile + 2Cl-phenol) at different molar ratios of the two components. Raman spectra were recorded in the different spectral regions, 990-1070 cm −1 and 2170-2300 cm −1 . Ring-breathing mode of 2Cl-phenol exhibited two components, which were attributed to the neat and self-associated dimer of 2Cl-phenol molecules. The self-associated structure of the dimer was obtained by geometry optimization. Other structures, which were calculated, include self-associated structure of acrylonitrile and the hydrogen-bonded complex of (acrylonitrile + 2Cl-phenol). All the geometry optimizations were made using density functional theory (DFT) and B3LYP functional employing the 6-31+G(d,p) basis set. The variations of the linewidth and the peak position with concentration are explained on the basis of a model, which includes both the effect of concentration fluctuation in a microscopic volume and the influence of concentration-dependent microviscosity based on a model proposed recently by our group.

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“…A rigorous study of the vibrational dephasing process is, however, possible through time-resolved Raman techniques. 5,6 Nevertheless, polarized Raman spectroscopy is still a useful technique that can readily be applied to study the vibrational dephasing and has an advantage that the isotropic part of the Raman scattered intensity can directly give the dephasing time.…”

Section: Introductionmentioning

confidence: 99%

Influence of self-association and inter-molecular hydrogen bonding on the ν(C N) stretching mode of CH3C N and C2H5C N in binary mixtures with CH3OHA comparative study via concentration-dependent polarized Raman study andab initio calculation

Srivastava

Ojha

Raghuvansh

et al. 2006

J. Raman Spectrosc.

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3 OH) has been made using a scanning multichannel detection technique, which is also more precise, especially when the observed Raman line profile has multiple components. The spectra in the n(C N) stretching region (2220-2280 cm −1 ) for both the reference systems were recorded with varying mole fractions of the reference molecule, CH 3 C N/C 2 H 5 C N, from 0.9 to 0.1. Ab initio calculations on the optimized structure and wavenumber position of the n(C N) stretching mode of neat CH 3 C N and C 2 H 5 C N and their self-associated and hydrogen-bonded complex reveal that the wavenumber position of the n(C N) stretching mode is shifted towards higher Raman wavenumbers because of both selfassociation and the hydrogen-bonded complex. This shift has been explained in terms of the repulsive interaction between the solute and solvent molecules. The dephasing of n(C N) stretching mode with concentration shows that the viscosity dependent contribution is much more prominent than that due to concentration fluctuation.

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Resonant vibrational dephasing investigated by high-precision femtosecond CARS

Cited by 43 publications

References 40 publications

Ultra-Broadband Time-Resolved Coherent Anti-Stokes Raman Scattering Spectroscopy and Microscopy with Photonic Crystal Fiber Generated Supercontinuum

Ultra-Broadband Time-Resolved Coherent Anti-Stokes Raman Scattering Spectroscopy and Microscopy with Photonic Crystal Fiber Generated Supercontinuum

Probing self‐associated structures of the solute molecule, acrylonitrile, the solvent molecule 2Cl‐phenol and their binary complexes via concentration‐dependent Raman study and DFT calculation

Influence of self-association and inter-molecular hydrogen bonding on the ν(C N) stretching mode of CH3C N and C2H5C N in binary mixtures with CH3OHA comparative study via concentration-dependent polarized Raman study andab initio calculation

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