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Spectroscopy and imaging of photoelectrons and photoions in real-time (SAPPHIRE)

Spectroscopy and imaging of photoelectrons and photoions in real-time (SAPPHIRE)


In this project, we are studying the dynamics of atomic and molecular systems attached to superfluid helium nanodroplets. The systems and processes investigated in the framework of this project, such as the pentacene-C60 complex, are promising testbeds for the development of new and advanced solar cells. Furthermore, the results of our studies provide an improved understanding of the interplay between the helium nanodroplet environment and the atomic or molecular species embedded into the droplet.

In order to study light-induced dynamics, we apply time-resolved photoion/-electron spectrometry. Femtosecond pump-probe spectroscopy at various wavelengths (UV to NIR) is combined with velocity-map imaging (VMI) and time-of-flight (TOF) detection of the thus produced photoelectrons and photoions. In combination with helium nanodroplet isolation, this setup offers extraordinary versatility and allows for the detailed study of the complex dynamics.

This work is part of the ERC advanced grant "Coherent multidimensional spectroscopy of controlled isolated systems (COCONIS)".



Photograph of the vacuum setup used for this project.

Electron-VMI resulting

Electron-VMI resulting from the resonance-enhanced ionization of potassium atoms.


Relevant publications:

[22] Coppens F, v Vangerow J, Leal A, Barranco M, Halberstadt N, Mudrich M, Pi M, Stienkemeier F:
Fall-back time for photo-ionized Cs atoms attached to superfluid 4He nanodroplets
Eur Phys J D, 2019; 73 (94).: abstract - pdf

[21] Dozmorov N V, Baklanov A V, Vangerow J, Stienkemeier F, Fordyce J A M, Mudrich M:
Quantum dynamics of Rb atoms desorbing off the surface of He nanodroplets
Phys Rev A, 2018; 98 (4): 043403-1-043403-9.: abstract - pdf - arXiv

[20] Coppens F, von Vangerow J, Barranco M, Halberstadt N, Stienkemeier F, Pi M, Mudrich M:
Desorption dynamics of RbHe exciplexes off He nanodroplets induced by spin-relaxation
Phys Chem Chem Phys, 2018; 20 (14): 9309-9320.: abstract - pdf

[19] Vangerow J, Coppens F, Leal A, Pi M, Barranco M, Halberstadt N, Stienkemeier F, Mudrich M:
Imaging Excited-State Dynamics of Doped He Nanodroplets in Real-Time
J Phys Chem Lett, 2017; 8 (1): 307-312.: abstract - pdf

[18] Sieg A, Vangerow J, Stienkemeier F, Dulieu O, Mudrich M:
Desorption Dynamics of Rb2 Molecules Off the Surface of Helium Nanodroplets
The journal of Physical Chemistry A, 2016; 120 (39): 7641-7649: abstract - pdf - arXiv

[17] Vangerow J, Bogomolov A S, Dozmorov N V, Schomas D, Stienkemeier F, Baklanov A V, Mudrich M:
Role of ion-pair states in the predissociation dynamics of Rydberg states of molecular iodine
Phys Chem Chem Phys, 2016; 18 (28): 18896-18904: abstract - pdf

[16] Vangerow J, John O, Stienkemeier F, Mudrich M:
Dynamics of solvation and desolvation of rubidium attached to He nanodroplets
J Chem Phys, 2015; 143 (3): 034302-1-03402-9.: abstract - pdf - arXiv

[15] Schmidt H, Vangerow v J, Stienkemeier F, Bogomolov A S, Baklanov A V, Reich D M, Skomorowski W, Koch C P, Mudrich M:
Predissociation dynamics of lithium iodide
J Chem Phys, 2015; 142 (4): 044303-1-044303-8.: abstract - pdf - arXiv

[14] Vangerow J, Sieg A, Stienkemeier F, Mudrich M, Leal A, Mateo D, Hernando A, Barranco M, Pi M:
Desorption Dynamcis of Heavy Alkali Metal Atoms (Rb, Cs) Off the Surface of Helium Nanodroplets
J Phys Chem A, 2014; 118 (33): 6604-6614.: abstract - pdf - arXiv

[13] Bogomolov A S, Grüner B, Kochubei S A, Mudrich M, Baklanov A V:
Predissociation of high-lying Rydberg states of molecular iodine via ion-pair states
The Journal of Chemical Physics, 2014; 140 (12): 124311-1-124311-9.: abstract - pdf

[12] Giese C, Mullins T, Grüner B, Weidemüller M, Stienkemeier F, Mudrich M:
Formation and relaxation of RbHe exciplexes on He nanodroplets studied by femtosecond pump and picosecond probe spectroscopy
J Chem Phys, 2012; 137 (24): 244307-1-244307-7.: abstract - pdf - arXiv

[11] Fechner L, Grüner B, Sieg A, Callegari C, Ancilotto F, Stienkemeier F, Mudrich M:
Photoionization and imaging spectroscopy of rubidium atoms attached to helium nanodroplets
Phys Chem Chem Phys, 2012; 14: 3843-3851.: abstract - pdf> - arXiv

[10] Giese C, Stienkemeier F, Mudrich M, Hauser A W, Ernst W:
Homo- and heteronuclear alkali metal trimers formed on helium nanodroplets. Part II. Femtosecond spectroscopy and spectra assignments
Phys Chem Chem Phys, 2011; 13 (42): 18769-18780.: abstract - pdf - arXiv

[9] Grüner B, Schlesinger M, Heister P, Strunz W, Stienkemeier F, Mudrich M:
Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets
PCCP, 2011; 13 (15): 6816-6826.: abstract - pdf - arXiv

[8] Schlesinger M, Mudrich M, Stienkemeier F, Strunz W:
Dissipative vibrational wave packet dynamics of alkali dimers attached to helium nanodroplets
Chem Phys Lett, 2010; 490 (4-6): 245-248.: abstract - pdf

[7] Mudrich M, Heister P, Hippler T, Giese C, Dulieu O, Stienkemeier F:
Spectroscopy of triplet states of Rb2 by femtosecond pump-probe photoionization of doped helium nanodroplets
Phys Rev A, 2009; 80 (4): 042512-1-042512-12.: abstract - pdf - arXiv

[6] Mudrich M, Stienkemeier F, Droppelmann G, Claas P, Schulz C P:
Quantum Interference Spectroscopy of Rubidium-Helium Exciplexes Formed on Helium Nanodroplets
Phys Rev Lett, 2008; 100 (2): 023401-1-023401-4.: abstract - pdf - arXiv

[5] Claas P, Droppelmann G, Schulz C P, Mudrich M, Stienkemeier F:
Wave Packet Dynamics in Triplet States of Na2 Attached to Helium Nanodroplets
Journal of Physical Chemistry, 2007; 111 (31): 7537-7541.: abstract - pdf - >arXiv

[4] Claas P, Droppelmann G, Schulz C P, Mudrich M, Stienkemeier F:
Wave packet dynamics of K2 attached to helium nanodroplets
J Phys B-at Mol Opt, 2006; 39: 1151-1168.: abstract - pdf - arXiv

[3] Droppelmann G, Bünermann O, Schulz C P, Stienkemeier F:
Formation Times of RbHe Exciplexes on the Surface of Superfluid vs. Normalfluid Helium Nanodroplets
Phys. Rev. Lett., 2004; 93 (2): 023402-1-023402-4.: abstract - pdf

[2] Schulz C P, Claas P, Stienkemeier F:
Formation of K*He Exciplexes on the Surface of Helium Nanodroplets Studied in Real Time
Phys. Rev. Lett., 2001; 87 (15): 153401-1-153401-4.: abstract - pdf

[1] Stienkemeier F, Meier F, Hägele A, Lutz H O, Schreiber E, Schulz C P, Hertel I V:
Coherence and Relaxation in Potassium-Doped Helium Droplets Studied by Femtosecond Pump-Probe Spectroscopy
Phys. Rev. Lett., 1999; 83 (12): 2320-2323.: abstract - pdf



Deutsche Forschungsgemeinschaft

International Research Training Group (IRTG 2079) "Cold Controlled Ensembles in Physics and Chemistry"

European Research Council

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