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        <titl xml:lang="sv">Undersökning av elektronisk dekoherens med högupplöst attosekund-fotoelektroninterferometri</titl>
        <parTitl xml:lang="en">Probing electronic decoherence with high-resolution attosecond photoelectron
interferometry</parTitl>
        <IDNo agency="SND">2022-53-1-1</IDNo>
        <IDNo agency="DOI">https://doi.org/10.5878/mtfm-b338</IDNo>
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    <citation>
      <titlStmt>
        <titl xml:lang="sv">Undersökning av elektronisk dekoherens med högupplöst attosekund-fotoelektroninterferometri</titl>
        <parTitl xml:lang="en">Probing electronic decoherence with high-resolution attosecond photoelectron
interferometry</parTitl>
        <IDNo agency="SND">2022-53-1-1</IDNo>
        <IDNo agency="DOI">https://doi.org/10.5878/mtfm-b338</IDNo>
        <IDNo agency="DOI">10.48550/arXiv.2111.12037</IDNo>
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        <IDNo agency="DOI">10.1140/epjd/s10053-022-00438-y</IDNo>
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        <AuthEnty xml:lang="en" affiliation="Department of Physics, Lund University">Busto, David</AuthEnty>
        <AuthEnty xml:lang="sv" affiliation="Fysiska institutionen, Lunds universitet">Busto, David</AuthEnty>
        <AuthEnty xml:lang="en" affiliation="Department of physics, Lund University">Zhong, Shiyang</AuthEnty>
        <AuthEnty xml:lang="sv" affiliation="Fysiska institutionen, Lunds universitet">Zhong, Shiyang</AuthEnty>
        <AuthEnty xml:lang="en" affiliation="Department of Physics, Lund University">Arnold, Cord</AuthEnty>
        <AuthEnty xml:lang="sv" affiliation="Fysiska institutionen, Lunds universitet">Arnold, Cord</AuthEnty>
        <AuthEnty xml:lang="en" affiliation="Physics Department, Lund University">Gisselbrecht, Mathieu</AuthEnty>
        <AuthEnty xml:lang="sv" affiliation="Fysiska institutionen, Lunds universitet">Gisselbrecht, Mathieu</AuthEnty>
        <AuthEnty xml:lang="en" affiliation="Department of Physics, Lund University">L'Huillier, Anne</AuthEnty>
        <AuthEnty xml:lang="sv" affiliation="Fysiska institutionen, Lunds universitet">L'Huillier, Anne</AuthEnty>
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        <grantNo xml:lang="en" agency="Knut and Alice Wallenberg Foundation">2017.0104</grantNo>
        <grantNo xml:lang="sv" agency="Knut och Alice Wallenberg Stiftelse">2017.0104</grantNo>
        <grantNo xml:lang="en" agency="European Research Council">339253</grantNo>
        <grantNo xml:lang="sv" agency="Europeiska forskningsrådet">339253</grantNo>
        <grantNo xml:lang="en" agency="Swedish Research Council">2013-08185</grantNo>
        <grantNo xml:lang="sv" agency="Vetenskapsrådet">2013-08185</grantNo>
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        <distrbtr xml:lang="sv" abbr="SND" URI="https://snd.se">Svensk nationell datatjänst</distrbtr>
        <distDate xml:lang="en" date="2022-03-25" />
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        <keyword xml:lang="en" vocab="MeSH" vocabURI="http://id.nlm.nih.gov/mesh/D007368">Interferometry</keyword>
        <keyword xml:lang="sv" vocab="MeSH" vocabURI="http://id.nlm.nih.gov/mesh/D007368">Interferometri</keyword>
        <keyword xml:lang="en" vocab="YSO" vocabURI="http://www.yso.fi/onto/yso/p38828">quantum entanglement</keyword>
        <keyword xml:lang="sv" vocab="YSO" vocabURI="http://www.yso.fi/onto/yso/p38828">kvantsammanflätning</keyword>
      </subject>
      <abstract xml:lang="en" contentType="abstract">We investigate the photoionization of helium atoms by attosecond pulse trains generated via high-order harmonic generation in neon gas. In the frequency domain these attosecond pulse trains correspond to a comb of odd harmonics. The wavelength of the infrared field used for high harmonic generation is chosen so that the 39th harmonic is resonant with the 2s2p resonance in helium situated at 60.147 eV. The attosecond pulse trains are overlapped spatially and temporally with a delayed infrared probe pulse with 10 nm bandwidth and a central wavelength of 800nm. Both pulses are focused on an effusive helium gas jet using a toroidal mirror. The resulting photoelectron spectrum is measured using a 2-meter long magnetic bottle electron spectrometer. The experiments consist in measuring the photoelectron spectrum as a function of the delay between the attosecond pulse train and the infrared probe pulse.  

The photoelectron spectra exhibit small photoelectron peaks (sidebands) originating from the interference of two photon transitions. These peaks oscillate as a function of the delay between the attosecond pulse train and the infrared field at twice the angular frequency of the probe pulse. We extract the amplitude and phase of the sideband oscillations adjacent to the resonant harmonic. We observe a different amplitude and phase variation in the two sidebands that we interprete as signature of decoherence in the upper harmonic due to coupling to the 2p2 state.

The data is acquired using a 2m-long magnetic bottle electron spectrometer. An acceleration voltage of 2V is applied on the permanent magnet and  the gas needle and a retarding potential of 34V is applied at the entrance of the flight tube. The design of the MBES is based on the following publication: J. H. Eland et al., Phys. Rev. Lett. 90, 053003 (2003).

The experiments consist in measuring time-of-flight spectra as a function of the delay between the attosecond pulse train and the IR probe field.

spectrogram.txt is a matrix (41x5001), where each row corresponds to the time of flight spectrum of the photoelectron for a given delay. The values in this matrix correspond to the number of electrons detected for a given delay (rows) and time-of-flight (columns).
delay.txt is a vector containing  41 entries corresponding the values of the delay in femtoseconds.
TOF.txt is a vector containing 5001 entries corresponding to the values of the electron time of flight in nanoseconds.</abstract>
      <abstract xml:lang="sv" contentType="abstract">Vi undersöker fotojonisation av heliumatomer med attosekundspulståg som genereras via övertonsgenerering i neongas. I frekvensdomänen motsvaras attosekundspulståget av en frekvenskam med udda övertoner. Våglängden på det infraröda probfältet som används för övertonsgenering är vald så att den 39:e övertonen är resonant med 2s2p-resonansen i helium belägen vid 60,147 eV. Attosekundpulståget överlappas spatialt och temporärt med en fördröjd infraröd probpuls med en bandbredd på 10 nm och en central våglängd på 800 nm. Båda pulserna fokuseras med en toroidspegel på en helium gasjet. Det resulterande fotoelektronspektrumet mäts med en 2 meter lång magnetisk flaskelektronspektrometer. Experimenten går ut på att mäta fotoelektronspektrat som en funktion av fördröjningen mellan attosekundspulståget och den infraröda probpulsen.

Fotoelektronspektrat uppvisar små fotoelektrontoppar (sidband) som härrör från interferensen av två fotonövergångar. Dessa toppar oscillerar som en funktion av fördröjningen mellan attosekundenpulståget och det infraröda probfältet med två gånger vinkelfrekvensen för probpulsen. Vi extraherar amplituden och fasen för sidbandsoscillationen vid resonansövertonen. Vi observerar olika amplitud och fasvariation i de två sidbanden som vi tolkar som en signatur för dekoherens i den övre övertonen på grund av kopplingen till 2p2-tillståndet.

Vänligen se engelska katalogsidan för mer information.</abstract>
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        <restrctn xml:lang="en">Access to data through SND. Data are freely accessible.</restrctn>
        <restrctn xml:lang="sv">Åtkomst till data via SND. Data är fritt tillgängliga.</restrctn>
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        <citation>
          <titlStmt>
            <titl xml:lang="sv">Busto et al., Probing electronic decoherence with high-resolution attosecond photoelectron interferometry, arXiv:2111.12037</titl>
            <parTitl xml:lang="en">Busto et al., Probing electronic decoherence with high-resolution attosecond photoelectron interferometry, arXiv:2111.12037</parTitl>
            <IDNo agency="DOI">10.48550/arXiv.2111.12037</IDNo>
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            <titl xml:lang="sv">Busto, D., Laurell, H., Finkelstein-Shapiro, D., Alexandridi, C., Isinger, M., Nandi, S., Squibb, R. J., Turconi, M., Zhong, S., Arnold, C. L., Feifel, R., Gisselbrecht, M., Salières, P., Pullerits, T., Martín, F., Argenti, L., &amp; L’Huillier, A. (2022). Probing electronic decoherence with high-resolution attosecond photoelectron interferometry. In European Physical Journal D (No. 112; Vol. 76, Issue 7).</titl>
            <parTitl xml:lang="en">Busto, D., Laurell, H., Finkelstein-Shapiro, D., Alexandridi, C., Isinger, M., Nandi, S., Squibb, R. J., Turconi, M., Zhong, S., Arnold, C. L., Feifel, R., Gisselbrecht, M., Salières, P., Pullerits, T., Martín, F., Argenti, L., &amp; L’Huillier, A. (2022). Probing electronic decoherence with high-resolution attosecond photoelectron interferometry. In European Physical Journal D (No. 112; Vol. 76, Issue 7).</parTitl>
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