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Spectrally resolved photon echo spectroscopy of Zn(II), Co(II) and Ni(II)-octaethyl porphyrins.

Karthick Kumar SK, Tiwari V, Goswami T, Goswami D - Chem Phys Lett (2009)

Bottom Line: Spectrally resolved femtosecond three-pulse photon echo signal from some metal-octaethyl porphyrins (OEPs) like Zn(II)-OEP, Ni(II)-OEP, Co(II)-OEP is reported.Excited state dynamics is studied by time evolving photon echo spectra for different values of coherence and population relaxation times.For all these metallo-porphyrins, the electronic relaxation timescale is found to be limited by our laser pulsewidth of 50 fs whereas the timescale for intramolecular vibrational relaxation, occurring within the Q(00) band was found to be over a picosecond for Co(II)-OEP and Ni(II)-OEP and within a picosecond for Zn(II)-OEP.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.

ABSTRACT
Spectrally resolved femtosecond three-pulse photon echo signal from some metal-octaethyl porphyrins (OEPs) like Zn(II)-OEP, Ni(II)-OEP, Co(II)-OEP is reported. Excited state dynamics is studied by time evolving photon echo spectra for different values of coherence and population relaxation times. Dependence on the spectrally resolved photon echo spectra on varying metal center is analyzed. For all these metallo-porphyrins, the electronic relaxation timescale is found to be limited by our laser pulsewidth of 50 fs whereas the timescale for intramolecular vibrational relaxation, occurring within the Q(00) band was found to be over a picosecond for Co(II)-OEP and Ni(II)-OEP and within a picosecond for Zn(II)-OEP.

No MeSH data available.


Related in: MedlinePlus

(a) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = − k1 + k2 + k3 versus population time t23 for t12 = −50 fs. (b) One colour three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = 0 fs. (c) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = +50 fs.
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fig2: (a) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = − k1 + k2 + k3 versus population time t23 for t12 = −50 fs. (b) One colour three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = 0 fs. (c) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = +50 fs.


Spectrally resolved photon echo spectroscopy of Zn(II), Co(II) and Ni(II)-octaethyl porphyrins.

Karthick Kumar SK, Tiwari V, Goswami T, Goswami D - Chem Phys Lett (2009)

(a) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = − k1 + k2 + k3 versus population time t23 for t12 = −50 fs. (b) One colour three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = 0 fs. (c) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = +50 fs.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2723920&req=5

fig2: (a) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = − k1 + k2 + k3 versus population time t23 for t12 = −50 fs. (b) One colour three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = 0 fs. (c) One color three-pulse photon echo spectra (central wavelength 550 nm) of Zn–OEP in the direction ks = −k1 + k2 + k3 versus population time t23 for t12 = +50 fs.
Bottom Line: Spectrally resolved femtosecond three-pulse photon echo signal from some metal-octaethyl porphyrins (OEPs) like Zn(II)-OEP, Ni(II)-OEP, Co(II)-OEP is reported.Excited state dynamics is studied by time evolving photon echo spectra for different values of coherence and population relaxation times.For all these metallo-porphyrins, the electronic relaxation timescale is found to be limited by our laser pulsewidth of 50 fs whereas the timescale for intramolecular vibrational relaxation, occurring within the Q(00) band was found to be over a picosecond for Co(II)-OEP and Ni(II)-OEP and within a picosecond for Zn(II)-OEP.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.

ABSTRACT
Spectrally resolved femtosecond three-pulse photon echo signal from some metal-octaethyl porphyrins (OEPs) like Zn(II)-OEP, Ni(II)-OEP, Co(II)-OEP is reported. Excited state dynamics is studied by time evolving photon echo spectra for different values of coherence and population relaxation times. Dependence on the spectrally resolved photon echo spectra on varying metal center is analyzed. For all these metallo-porphyrins, the electronic relaxation timescale is found to be limited by our laser pulsewidth of 50 fs whereas the timescale for intramolecular vibrational relaxation, occurring within the Q(00) band was found to be over a picosecond for Co(II)-OEP and Ni(II)-OEP and within a picosecond for Zn(II)-OEP.

No MeSH data available.


Related in: MedlinePlus