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  <doc>
    <id>1770</id>
    <completedYear>2023</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>25</volume>
    <type>article</type>
    <publisherName>Institute of Physics (IOP)</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Long-lasting XUV activation of helium nanodroplets for avalanche ionization</title>
    <abstract language="eng">We study the dynamics of avalanche ionization of pure helium nanodroplets activated by a weak extreme-ultraviolet (XUV) pulse and driven by an intense near-infrared (NIR) pulse. In addition to a transient enhancement of ignition of a nanoplasma at short delay times ${\sim}200$ fs, long-term activation of the nanodroplets lasting up to a few nanoseconds is observed. Molecular dynamics simulations suggest that the short-term activation is caused by the injection of seed electrons into the droplets by XUV photoemission. Long-term activation appears due to electrons remaining loosely bound to photoions which form stable 'snowball' structures in the droplets. Thus, we show that XUV irradiation can induce long-lasting changes of the strong-field optical properties of nanoparticles, potentially opening new routes to controlling avalanche-ionization phenomena in nanostructures and condensed-phase systems.</abstract>
    <parentTitle language="eng">New Journal of Physics</parentTitle>
    <identifier type="urn">urn:nbn:de:kobv:526-opus4-17701</identifier>
    <enrichment key="opus.import.data">@articleMedina_2023, doi = 10.1088/1367-2630/acd5f6, url = https://dx.doi.org/10.1088/1367-2630/acd5f6, year = 2023, month = may, publisher = IOP Publishing, volume = 25, number = 5, pages = 053030, author = C Medina and A Ø Lægdsmand and L Ben Ltaief and Z Hoque and A H Roos and L Jurkovičová and O Hort and O Finke and M Albrecht and J Nejdl and F Stienkemeier and J Andreasson and E Klimešová and M Krikunova and A Heidenreich and M Mudrich, title = Long-lasting XUV activation of helium nanodroplets for avalanche ionization, journal = New Journal of Physics, abstract = We study the dynamics of avalanche ionization of pure helium nanodroplets activated by a weak extreme-ultraviolet (XUV) pulse and driven by an intense near-infrared (NIR) pulse. In addition to a transient enhancement of ignition of a nanoplasma at short delay times  fs, long-term activation of the nanodroplets lasting up to a few nanoseconds is observed. Molecular dynamics simulations suggest that the short-term activation is caused by the injection of seed electrons into the droplets by XUV photoemission. Long-term activation appears due to electrons remaining loosely bound to photoions which form stable ‘snowball’ structures in the droplets. Thus, we show that XUV irradiation can induce long-lasting changes of the strong-field optical properties of nanoparticles, potentially opening new routes to controlling avalanche-ionization phenomena in nanostructures and condensed-phase systems.</enrichment>
    <enrichment key="opus.import.dataHash">md5:2286a4ca37664d1b83b0a3628525b361</enrichment>
    <enrichment key="opus.import.date">2023-07-19T07:04:56+00:00</enrichment>
    <enrichment key="opus.import.file">/tmp/phpIjh2Ct</enrichment>
    <enrichment key="opus.import.format">bibtex</enrichment>
    <enrichment key="opus.import.id">64b78b1817cac9.61746059</enrichment>
    <enrichment key="DOI_VoR">https://doi.org/10.1088/1367-2630/acd5f6</enrichment>
    <enrichment key="SourceTitle">C Medina et al 2023 New J. Phys. 25 053030</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Cristian Medina</author>
    <author>Asbjørn Ørnemark Lægdsmand</author>
    <author>Ltaief Ben Ltaief</author>
    <author>Ziaul Hoque</author>
    <author>Andreas Hult Roos</author>
    <author>Lucie Jurkovičová</author>
    <author>Ondřej Hort</author>
    <author>Ondřej Finke</author>
    <author>Martin Albrecht</author>
    <author>Jaroslav Nejdl</author>
    <author>Frank Stienkemeier</author>
    <author>Jakob Andreasson</author>
    <author>Eva Klimešová</author>
    <author>Maria Krikunova</author>
    <author>Andreas Heidenreich</author>
    <author>Marcel Mudrich</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>nanoplasma</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>helium nanodroplet</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>pump–probe spectroscopy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>avalanche ionization</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>high-harmonic generation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>extreme ultraviolet</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">Fachbereich Ingenieur- und Naturwissenschaften</collection>
    <collection role="open_access" number="">open_access</collection>
    <collection role="green_open_access" number="1">Gold Open Access</collection>
    <thesisPublisher>Technische Hochschule Wildau</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-th-wildau/files/1770/Medina_2023_New_J._Phys._25_053030.pdf</file>
  </doc>
  <doc>
    <id>2105</id>
    <completedYear>2026</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>1</issue>
    <volume>16</volume>
    <type>article</type>
    <publisherName>Springer Nature</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">XUV fluorescence as a probe of interatomic coulombic decay of resonantly excited He nanodroplets</title>
    <abstract language="eng">Superfluid He nanodroplets resonantly excited by extreme ultraviolet (XUV) pulses can relax via interatomic coulombic decay (ICD), generally considered an ultrafast process. Here, we introduce a novel approach to probe the dynamics of ICD in He nanodroplets over timescales ranging from femtoseconds to nanoseconds. Our method relies on detecting XUV fluorescence emitted from the nanodroplets as they are driven into a nanoplasma by subsequent intense infrared pulses. Nanoplasma ignition is facilitated by tunnel ionization of XUV-excited He∗ atoms attached to the droplets; it thus serves as a sensitive probe of their relaxation dynamics. The observed nanosecond-scale decay is attributed to ICD between pairs of He∗ atoms undergoing roaming motion on the droplet surface, as supported by quantum-mechanical and classical model calculations.</abstract>
    <parentTitle language="eng">Scientific Reports</parentTitle>
    <identifier type="urn">urn:nbn:de:kobv:526-opus4-21050</identifier>
    <enrichment key="opus.import.date">2026-01-13T09:41:09+00:00</enrichment>
    <enrichment key="opus.source">sword</enrichment>
    <enrichment key="opus.import.user">sword</enrichment>
    <enrichment key="DOI_VoR">https://doi.org/10.1038/s41598-025-34677-x</enrichment>
    <enrichment key="SourceTitle">Sishodia, K., Ltaief, L.B., Scheel, N. et al. XUV fluorescence as a probe of interatomic coulombic decay of resonantly excited He nanodroplets. Sci Rep 16, 1321 (2026). https://doi.org/10.1038/s41598-025-34677-x</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Keshav Sishodia</author>
    <author>Ltaief Ben Ltaief</author>
    <author>Niklas Scheel</author>
    <author>István B. Földes</author>
    <author>Andreas Hult Roos</author>
    <author>Martin Albrecht</author>
    <author>Matyáš Staněk</author>
    <author>Lucie Jurkovičová</author>
    <author>Ondrej Hort</author>
    <author>Jaroslav Nejdl</author>
    <author>Ernesto García-Alfonso</author>
    <author>Nadine Halberstadt</author>
    <author>Jakob Andreasson</author>
    <author>Eva Klimešová</author>
    <author>Maria Krikunova</author>
    <author>Sivarama Krishnan</author>
    <author>Andreas Heidenreich</author>
    <author>Marcel Mudrich</author>
    <collection role="ddc" number="535">Licht, Infrarot- und Ultraviolettphänomene</collection>
    <collection role="ddc" number="539">Moderne Physik</collection>
    <collection role="institutes" number="">Fachbereich Ingenieur- und Naturwissenschaften</collection>
    <collection role="open_access" number="">open_access</collection>
    <collection role="Import" number="import">Import</collection>
    <collection role="green_open_access" number="1">Gold Open Access</collection>
    <thesisPublisher>Technische Hochschule Wildau</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-th-wildau/files/2105/s41598-025-34677-x.pdf</file>
  </doc>
</export-example>
