Microsolvation of Phthalocyanines in Superfluid Helium Droplets

Lehnig, Rudolf; Slenczka, Alkwin

doi:10.1002/cphc.200400022

Cited by 30 publications

(55 citation statements)

References 23 publications

(35 reference statements)

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“…7,25,26,31,[38][39][40] Thus, the intramolecular contributions to fluorescence, r,droplet bβ , can be neglected. diss bβ may depend on the excited state bβ since the relaxation into the vibrational ground state of S 1 may compete with other processes such as relaxation into possible dark states or into the electronic ground state or long lived triplet states.…”

Section: Discussionmentioning

confidence: 99%

Electronic spectroscopy of 9,10-dichloroanthracene inside helium droplets

Pentlehner

Slenczka

2013

The Journal of Chemical Physics

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The spectroscopy of molecules doped into superfluid helium droplets provides information on both, the dopant molecule and the helium environment. Electronic spectra of 9,10-dichloroanthracene in helium droplets are presented and compared with corresponding gas phase spectra to unravel the influence of the helium environment. The combined investigation of fluorescence excitation and dispersed emission provides information on dynamic processes in addition to energetic conditions. For vibronic states, the helium induced decay channels dominate over all intramolecular channels that contribute to the gas phase behavior. In addition to the triplet splitting caused by the Cl isotopes, a fine structure resolved for all transitions in the fluorescence excitation spectrum was found, which is the signature of microsolvation of this compound in helium droplets. This fine structure is identified as a single pure molecular transition accompanied by a sharply structured phonon wing. The corresponding fine structure measured for bare anthracene shows remarkable differences.

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Section: Discussionmentioning

confidence: 99%

Electronic spectroscopy of 9,10-dichloroanthracene inside helium droplets

Pentlehner

Slenczka

2013

The Journal of Chemical Physics

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“…This structure has been seen for other vibronic bands of the transition, and the beam depletion spectra of the monomer compare well with the laser-induced fluorescence spectra that have been recorded earlier in the laboratory 4 and remeasured recently by Slenczka and collaborators. 5 We have to point out that perylene is a bad candidate for bolometric detection because of its large fluorescence quantum yield. However, if perylene is complexed with oxygen, which is known to be an efficient fluorescence quencher, we can expect an increase of the detection efficiency.…”

Section: Helium Nanodroplet Isolation Spectroscopy Of Perylene and Itmentioning

confidence: 99%

Helium nanodroplet isolation spectroscopy of perylene and its complexes with oxygen

Çarçabal

Schmied

Lehmann

et al. 2004

The Journal of Chemical Physics

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“…As revealed by the doubling of the entire dispersed emission spectrum, the S 0 –S 1 electronic excitation of Pc in helium droplets transfers the excited Pc-helium complex into a metastable configuration which partly relaxes prior to radiative decay (Lehnig and Slenczka, 2003, 2004a,b) (cf. Figure 1).…”

Section: Resultsmentioning

confidence: 99%

Microsolvation of molecules in superfluid helium nanodroplets revealed by means of electronic spectroscopy

et al. 2014

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The empirical model explaining microsolvation of molecules in superfluid helium droplets proposes a non-superfluid helium solvation layer enclosing the dopant molecule. This model warrants an empirical explanation of any helium induced substructure resolved for electronic transitions of molecules in helium droplets. Despite a wealth of such experimental data, quantitative modeling of spectra is still in its infancy. The theoretical treatment of such many-particle systems dissolved into a quantum fluid is a challenge. Moreover, the success of theoretical activities relies also on the accuracy and self-critical communication of experimental data. This will be elucidated by a critical resume of our own experimental work done within the last ten years. We come to the conclusion that spectroscopic data and among others in particular the spectral resolution depend strongly on experimental conditions. Moreover, despite the fact that none of the helium induced fine structure speaks against the empirical model for solvation in helium droplets, in many cases an unequivocal assignment of the spectroscopic details is not possible. This ambiguity needs to be considered and a careful and critical communication of experimental results is essential in order to promote success in quantitatively understanding microsolvation in superfluid helium nanodroplets.

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Microsolvation of Phthalocyanines in Superfluid Helium Droplets

Cited by 30 publications

References 23 publications

Electronic spectroscopy of 9,10-dichloroanthracene inside helium droplets

Electronic spectroscopy of 9,10-dichloroanthracene inside helium droplets

Helium nanodroplet isolation spectroscopy of perylene and its complexes with oxygen

Microsolvation of molecules in superfluid helium nanodroplets revealed by means of electronic spectroscopy

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