Line shape of resonance cars as an indicator for the scattering of molecules in ground or excited states

Lau, A.; König, Roland; Pfeiffer, M.

doi:10.1016/0030-4018(80)90318-1

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…This can be achieved by resonant Raman techniques, such as surface-enhanced resonant Raman scattering (SERRS)28 or coherent anti-Stokes resonant Raman scattering (CARRS)293031. However, in order to provide the ground and excited state information at the same time, the ratio between the ground and excited state vibrations needs to be controlled by adjusting the pump intensity during the measurements.…”

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confidence: 99%

Surface-Enhanced Impulsive Coherent Vibrational Spectroscopy

Harra

Virkki

et al. 2016

Sci Rep

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Surface-enhanced Raman spectroscopy (SERS) has attracted a lot of attention in molecular sensing because of the remarkable ability of plasmonic metal nanostructures to enhance the weak Raman scattering process. On the other hand, coherent vibrational spectroscopy triggered by impulsive excitation using ultrafast laser pulses provides complete information about the temporal evolution of molecular vibrations, allowing dynamical processes in molecular systems to be followed in “real time”. Here, we combine these two concepts and demonstrate surface-enhanced impulsive vibrational spectroscopy. The vibrational modes of the ground and excited states of poly[2-methoxy-5-(2-ethylhexyloxy)−1,4-phenylenevinylene] (MEH-PPV), spin-coated on a substrate covered with monodisperse silver nanoparticles, are impulsively excited with a sub-10 fs pump pulse and characterized with a delayed broad-band probe pulse. The maximum enhancement in the spectrally and temporally resolved vibrational signatures averaged over the whole sample is about 4.6, while the real-time information about the instantaneous vibrational amplitude together with the initial vibrational phase is preserved. The phase is essential to determine the vibrational contributions from the ground and excited states.

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mentioning

confidence: 99%

Surface-Enhanced Impulsive Coherent Vibrational Spectroscopy

Harra

Virkki

et al. 2016

Sci Rep

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“…Естественным развитием результатов, относящихся к проблеме иденти фикации центров рассеяния с помощью метода резонансного КАРС, стало тщательное изучение контура спектральных полос в родаминах [74].…”

Section: 3unclassified

Recent progress in dynamical spectroscopy of Raman light scattering

Bobovich¹

1992

Usp. Fiz. Nauk

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“…13 The actual frequency mismatch at which the extreme line shapes occur (at R and J = 0) is now largely dependent on the actual one-photon spectral function for the specific molecule investigated. The different behaviour in line shape alteration may be of practical use in deciding whether the scattering molecules are in the ground or in the excited state.…”

Section: Line Shape At Low Dye Concentrationmentioning

confidence: 99%

Investigation of broad molecular absorption bands with the help of line shape analysis in coherent Raman scattering experiments

Pfeffer

Lau

Werncke

1984

J Raman Spectroscopy

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The line shape observed in coherent Raman scattering (CRS) with excitation under conditions of electronic resonance is discussed, For the case of A-type scattering, the complex Raman amplitude is related directly to the molecular one-photon absorbance of the resonance transition concerned. The basis for this relation is transform theory, a method known from spontaneous resonance Raman scattering to relate the Raman excitation profile to the observed molecular absorbance. Features of the Raman amplitude, determining the observed line shapes for coherent anti-Stokes Raman scattering (CARS) and for coherent Stokes Raman scattering (CSRS), are discussed qualitatively. The discussion considers two typical forms in which broad molecular absorption spectra of polyatomic molecules in the condensed phases appear. Inhomogeneous broadening leads to characteristic changes of the Raman amplitude in relation to molecular absorbance in the case of CSRS (for molecules in the electronic ground state), whereas for CARS the relation derived in the homogeneous broadened case remains valid. The special advantages of the CRS technique for determining the complex non-Raman resonant (background) susceptibiiity from concentration dependence are demonstrated. I A ( w ) =-rr Im ao(w)is related to the Raman excitation profile t

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Line shape of resonance cars as an indicator for the scattering of molecules in ground or excited states

Cited by 15 publications

References 9 publications

Surface-Enhanced Impulsive Coherent Vibrational Spectroscopy

Surface-Enhanced Impulsive Coherent Vibrational Spectroscopy

Recent progress in dynamical spectroscopy of Raman light scattering

Investigation of broad molecular absorption bands with the help of line shape analysis in coherent Raman scattering experiments

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