Study and Characterization of Resonances in the Four-Wave Mixing Signal of a Two-Level System with Intramolecular Coupling

Paz, J. L.; Cusati, Teresa; Salazar, Mary C.; Hernández, Aureliano

doi:10.1006/jmsp.2001.8499

Cited by 6 publications

(9 citation statements)

References 25 publications

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“…Moreover, the squared polarization of the peak 2 is non-zero at f0.5, contrasting with the others peaks, which at this point have a null magnitude, and consequently will show null intensity. This fact can be explained because each peak is governed by particular terms of Polarization expression, which define its behavior [13]. Considering this aspect, it is posible to observe that the relative polarization expressions of the peaks 1, 2 and 4 are directly proportional with the squared of the longitudinal relaxation times, fact that is not true for the case of the peaks 3, 5 and 6, which are only proportional to the transversal relaxations times, and consequently do not change their values of Polarization.…”

Section: Resultsmentioning

confidence: 98%

<title>Effects of the changes in the relaxation times on the FWM response of push-pull molecules</title>

2004

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In the present work we have studied the changes in the FWM signal response considering the modification in the longitudinal and transversal relaxation times T1 and T2, respectively. These changes are obtained considering three cases of rate between longitudinal and transversal relaxation times T1/T2, with three orders of magnitude between them: a) 0.1, b) 1 and c) 10. These modifications are applied to push-pull molecules, taking into account the valence-bond charge-transfer model. Moreover, we have taken into account the symmetric values of V0 = 1 (corresponding to the electronic energy gap between the states involved in the model). Notable changes in maximal intensity of the peaks belong to the FWM spectrum are observed with the variation in the ratio between the relaxation times.

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Section: Resultsmentioning

confidence: 98%

<title>Effects of the changes in the relaxation times on the FWM response of push-pull molecules</title>

2004

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“…This fact is explained using the functional relation of the peaks to the polarization expression, which in turn defines their behavior [52]. From this relation, it is possible to show that the relative polarization expressions of peaks 1, 2, and 4 have an direct dependence with the longitudinal relaxation times, fact that is not true for the case of peaks 3, 5, and 6, which are only proportional to the transversal relaxations times.…”

Section: Resultsmentioning

confidence: 99%

“…The Fourier component to second-order in the pump beam and to first-order in the probe beam of the polarization is given by [52,53] …”

Section: The Fwm Signalmentioning

confidence: 99%

Relaxation times effects on the four wave-mixing signal for π-conjugated push-pull molecules within the two-state valence-bond charge-transfer model

Squitieri

Paz

Cusati

2005

Journal of Molecular Spectroscopy

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“…It is important to mention that the response ofthe peaks 2 and 6 is governed for the transition dipole moments, but the other peaks arise when the permanent dipole moments are included. Peak 2 is related with the coherence density matrix term, and peak 6 is related with the population density matrix elements [9].…”

Section: Macroscopic Polarizationmentioning

confidence: 99%

“…Due to the symmetry presented by the first six peaks respect to the other ones, only the first ones are considered in the present research work. Moreover, each peak is characterized by reduced polarization expressions that permit us to analyze its behavior with the changes in the coupling parameters [9].…”

Section: Macroscopic Polarizationmentioning

confidence: 99%

<title>Influence of intramolecular coupling parameters changes on dipole moments and macroscopic polarization</title>

Cusati

Paz

2004

SPIE Proceedings

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We have studied the effects of the changes in the intramolecular coupling parameters S (height) to which the vibronic coupling occurs), V0 (energetic difference between the minima of the potential curves) and v (coupling parameter), considering a two levels system described by two crossed harmonic potential curves. This work has been divided into two particular cases: a) simultaneous changes in S and v and b) simultaneous changes in S and Vo. In the first case we have observed an important increment of the polarization values for low values of v. In the particular case of resonance peak, an important increment of polarization values is observed with the increment of v. In the second case, an abruptly increasing in polarization values is observed to high values of S and low values of V0. In the particular case of resonance peak we observed the contrary behavior of the precedent case: a notable decreasing of the polarization values is observed with the increasing in v. These changes are associated to the modifications in the overlapping integral and consequently in the dipole moments of the states in the new coupled basis.

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Study and Characterization of Resonances in the Four-Wave Mixing Signal of a Two-Level System with Intramolecular Coupling

Cited by 6 publications

References 25 publications

<title>Effects of the changes in the relaxation times on the FWM response of push-pull molecules</title>

<title>Effects of the changes in the relaxation times on the FWM response of push-pull molecules</title>

Relaxation times effects on the four wave-mixing signal for π-conjugated push-pull molecules within the two-state valence-bond charge-transfer model

<title>Influence of intramolecular coupling parameters changes on dipole moments and macroscopic polarization</title>

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