Prof. Dr. Alejandro Saenz
Profil
Zusammenfassung
Prof. Saenz entwickelt theoretische Modelle zur Wechselwirkung von Atomen und Molekülen mit intensiven Laserfeldern. Seine Expertise umfasst die numerische Lösung quantenmechanischer Gleichungen zur Beschreibung von Ionisierung, Anregung und Elektronendynamik unter extremen Bedingungen. Diese Kompetenzen sind relevant für Anwendungen in der Lasertechnologie, Materialbearbeitung und Präzisionsmessungen in der Teilchenphysik.
Skills
Stammdaten
Identität, Organisation und Kontakt aus HU-FIS.
Forschungsthemen13
Aufbau von APPA bei FAIR: Entwicklung eines Kalibrierungsinstruments für hochintensive Laserlichtquellen
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 07/2018 - 10/2021 Projektleitung: Prof. Dr. Alejandro Saenz
Correlated Multielectron Dynamics in Intense Light Fields "CORINF" - HUM
Quelle ↗Zeitraum: 04/2011 - 03/2015 Projektleitung: Prof. Dr. Alejandro Saenz
FAIR-APPA: Theoretische Beschreibung hochgeladener Ionen in ultrakurzen intensiven Laserimpulsen
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 07/2012 - 06/2015 Projektleitung: Prof. Dr. Alejandro Saenz
Mögliche Industrie-Partner227
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Physical Review Letters · 418 Zitationen · DOI
In the tunneling regime of strong laser field ionization we measure a substantial fraction of neutral atoms surviving the laser pulse in excited states. The measured excited neutral atom yield extends over several orders of magnitude as a function of laser intensity. Our findings are compatible with the strong-field tunneling-plus-rescattering model, confirming the existence of a widely unexplored neutral exit channel (frustrated tunneling ionization). Strong experimental support for this mechanism as origin of excited neutral atoms stems from the dependence of the excited neutral yield on the laser ellipticity, which is as expected for a rescattering process. Theoretical support for the proposed mechanism comes from the agreement of the neutral excited state distribution centered at n = 6-10 obtained from both, a full quantum mechanical and a semiclassical calculation, in agreement with the experimental results.
Nature Physics · 410 Zitationen · DOI
Abstract Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, the absolute neutrino-mass scale remains unknown. Here we report the upper limits on effective electron anti-neutrino mass, m ν , from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, m ν is probed via a high-precision measurement of the tritium β -decay spectrum close to its endpoint. This method is independent of any cosmological model and does not rely on assumptions whether the neutrino is a Dirac or Majorana particle. By increasing the source activity and reducing the background with respect to the first physics campaign, we reached a sensitivity on m ν of 0.7 eV c –2 at a 90% confidence level (CL). The best fit to the spectral data yields $${{\mbox{}}}{m}_{\nu }^{2}{{\mbox{}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mstyle> <mml:mspace/> </mml:mstyle> <mml:msubsup> <mml:mrow> <mml:mi>m</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msubsup> <mml:mstyle> <mml:mspace/> </mml:mstyle> </mml:mrow> </mml:math> = (0.26 ± 0.34) eV 2 c –4 , resulting in an upper limit of m ν < 0.9 eV c –2 at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of m ν < 0.8 eV c –2 at 90% CL.
Physical Review Letters · 170 Zitationen · DOI
The ionization probability of ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, and ${\mathrm{CO}}_{2}$ in intense laser fields is studied theoretically as a function of the alignment angle by solving the time-dependent Schr\"odinger equation numerically assuming only the single-active-electron approximation. The results are compared to recent experimental data [D. Pavi\ifmmode \check{c}\else \v{c}\fi{}i\ifmmode \acute{c}\else \'{c}\fi{} et al., Phys. Rev. Lett. 98, 243001 (2007)] and good agreement is found for ${\mathrm{N}}_{2}$ and ${\mathrm{O}}_{2}$. For ${\mathrm{CO}}_{2}$ a possible explanation is provided for the failure of simplified single-active-electron models to reproduce the experimentally observed narrow ionization distribution. It is based on a field-induced coherent core-trapping effect.
Kooperationen10
Bestätigte Forscher↔Partner-Paare aus HU-FIS — Gold-Standard-Positive für das Matching.
Correlated Multielectron Dynamics in Intense Light Fields "CORINF" - HUM
other
Correlated Multielectron Dynamics in Intense Light Fields "CORINF" - HUM
other
Correlated Multielectron Dynamics in Intense Light Fields "CORINF" - HUM
university