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Ultra-Fast-VUV Photoemission Study of UV Excited 2-Nitrophenol
Petra Rudolf, Luca Poletto, Fabio Frassetto, Paolo Miotti, Antti Kivimak̈i, Monica de Simone, Cesare Grazioli, Barbara Ressel, Giovanni De Ninno, C. Spezzani, Carlo Callegari, Marcello Coreno, A. Ciavardini, Simona Fornarini, Marco Pezzella, Enrico Bodo, Susanna Piccirillo, 2019, izvirni znanstveni članek

Opis: The initial deactivation pathways of gaseous 2-nitrophenol excited at 268 nm were investigated by time-resolved photoelectron spectroscopy (TRPES) with femtosecond-VUV light, produced by a monochromatized high harmonic generation source. TRPES allowed us to obtain new, valuable experimental information about the ultrafast excited-state dynamics of 2-nitrophenol in the gas phase. In accord with recent ab initio on-the-fly nonadiabatic molecular dynamic simulations, our results validate the occurrence of an ultrafast intersystem crossing leading to an intermediate state that decays on a subpicosecond time scale with a branched mechanisms. Two decay pathways are experimentally observed. One probably involves proton transfer, leading to the most stable triplet aci-form of 2-nitrophenol; the second pathway may involve OH rotation. We propose that following intersystem crossing, an ultrafast fragmentation channel leading to OH or HONO loss could also be operative.
Najdeno v: osebi
Ključne besede: Ultrafast photoemission, nitrophenol
Objavljeno: 12.02.2019; Ogledov: 905; Prenosov: 0
.pdf Polno besedilo (1,81 MB)

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Photoelectric effect with a twist
Alberto Simoncig, Benedikt Rösner, Barbara Ressel, Oksana Plekan, Najmeh Mirian, Andrej Mihelič, Micheal Meyer, Michele Manfredda, Špela Krušič, Klaus Hansen, Luca Giannessi, Michele Di Fraia, Alexander Demidovich, Christian David, Miltcho B. Danailov, Marcello Coreno, E. Allaria, Primož Rebernik Ribič, Jonas Wätzel, Giovanni De Ninno, Simone Spampinati, Janez Štupar, Matjaž Žitnik, Marco Zangrando, Carlo Callegari, Jamal Berakdar, 2020, izvirni znanstveni članek

Opis: Photons have fixed spin and unbounded orbital angular momentum (OAM). While the former is manifested in the polarization of light, the latter corresponds to the spatial phase distribution of its wavefront1. The distinctive way in which the photon spin dictates the electron motion upon light– matter interaction is the basis for numerous well-established spectroscopies. By contrast, imprinting OAM on a mat- ter wave, specifically on a propagating electron, is gener- ally considered very challenging and the anticipated effect undetectable2. In refs. 3,4, the authors provided evidence of OAM-dependent absorption of light by a bound electron. Here, we seek to observe an OAM-dependent dichroic photo- electric effect, using a sample of He atoms. Surprisingly, we find that the OAM of an optical field can be imprinted coher- ently onto a propagating electron wave. Our results reveal new aspects of light–matter interaction and point to a new kind of single-photon electron spectroscopy.
Najdeno v: osebi
Ključne besede: FEL, OAM, Photoelectric effect
Objavljeno: 09.09.2020; Ogledov: 170; Prenosov: 0
.pdf Polno besedilo (2,45 MB)

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