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  1. Article ; Online: Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film.

    Virgili, Tersilla / Anni, Marco / Giorgi, Maria Luisa De / Varillas, Rocio Borrego / Squeo, Benedetta M / Pasini, Mariacecilia

    Molecules (Basel, Switzerland)

    2019  Volume 25, Issue 1

    Abstract: The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer ... ...

    Abstract The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10
    MeSH term(s) Aniline Compounds/chemistry ; Fluorenes/chemistry ; Light ; Luminescence ; Molecular Probes/chemistry ; Time Factors
    Chemical Substances Aniline Compounds ; Fluorenes ; Molecular Probes ; fluorene (3Q2UY0968A)
    Language English
    Publishing date 2019-12-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules25010079
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A systematic study of the valence electronic structure of cyclo(Gly-Phe), cyclo(Trp-Tyr) and cyclo(Trp-Trp) dipeptides in the gas phase.

    Molteni, Elena / Mattioli, Giuseppe / Alippi, Paola / Avaldi, Lorenzo / Bolognesi, Paola / Carlini, Laura / Vismarra, Federico / Wu, Yingxuan / Varillas, Rocio Borrego / Nisoli, Mauro / Singh, Manjot / Valadan, Mohammadhassan / Altucci, Carlo / Richter, Robert / Sangalli, Davide

    Physical chemistry chemical physics : PCCP

    2021  Volume 23, Issue 47, Page(s) 26793–26805

    Abstract: The electronic energy levels of cyclo(glycine-phenylalanine), cyclo(tryptophan-tyrosine) and cyclo(tryptophan-tryptophan) dipeptides are investigated with a joint experimental and theoretical approach. Experimentally, valence photoelectron spectra in the ...

    Abstract The electronic energy levels of cyclo(glycine-phenylalanine), cyclo(tryptophan-tyrosine) and cyclo(tryptophan-tryptophan) dipeptides are investigated with a joint experimental and theoretical approach. Experimentally, valence photoelectron spectra in the gas phase are measured using VUV radiation. Theoretically, we first obtain low-energy conformers through an automated conformer-rotamer ensemble sampling scheme based on tight-binding simulations. Then, different first principles computational schemes are considered to simulate the spectra: Hartree-Fock (HF), density functional theory (DFT) within the B3LYP approximation, the quasi-particle GW correction, and the quantum-chemistry CCSD method. Theory allows assignment of the main features of the spectra. A discussion on the role of electronic correlation is provided, by comparing computationally cheaper DFT scheme (and GW) results with the accurate CCSD method.
    MeSH term(s) Density Functional Theory ; Dipeptides/chemistry ; Electrons ; Gases/chemistry ; Oligopeptides/chemistry ; Peptides, Cyclic/chemistry ; Phenylalanine/chemistry ; Tryptophan/chemistry
    Chemical Substances Dipeptides ; Gases ; Oligopeptides ; Peptides, Cyclic ; cyclo(tryptophyl-tryptophyl) ; Phenylalanine (47E5O17Y3R) ; glycylphenylalanine (721-66-4) ; Tryptophan (8DUH1N11BX)
    Language English
    Publishing date 2021-12-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d1cp04050b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Microjoule-level, tunable sub-10 fs UV pulses by broadband sum-frequency generation.

    Varillas, Rocio Borrego / Candeo, Alessia / Viola, Daniele / Garavelli, Marco / De Silvestri, Sandro / Cerullo, Giulio / Manzoni, Cristian

    Optics letters

    2014  Volume 39, Issue 13, Page(s) 3849–3852

    Abstract: We introduce a scheme for the generation of tunable few-optical-cycle UV pulses based on sum-frequency generation between a broadband visible pulse and a narrowband pulse ranging from the visible to the near-IR. This configuration generates broadband UV ... ...

    Abstract We introduce a scheme for the generation of tunable few-optical-cycle UV pulses based on sum-frequency generation between a broadband visible pulse and a narrowband pulse ranging from the visible to the near-IR. This configuration generates broadband UV pulses tunable from 0.3 to 0.4 μm, with energy up to 1.5 μJ. By exploiting nonlinear phase transfer, transform-limited pulse durations are achieved. Full characterization of the UV pulse spectral phase is obtained by two-dimensional spectral shearing interferometry, which is here extended to the UV spectral range. We demonstrate clean 8.4 fs UV pulses.
    MeSH term(s) Electricity ; Interferometry/methods ; Models, Theoretical ; Nonlinear Dynamics ; Optical Devices ; Optical Phenomena ; Spectrophotometry, Ultraviolet ; Ultraviolet Rays
    Language English
    Publishing date 2014-07-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.39.003849
    Database MEDical Literature Analysis and Retrieval System OnLINE

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