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Theodor Hänsch: Laser Spectroscopy of Hydrogen


    • Mitschnitt einer Veranstaltung des Instituts für Quantenoptik, Quantennanophysik und Quanteninformation (IQOQI) am Donnerstag, dem 16. Dezember 2010 im Lise Meitner-Hörsaal der Fakultät für Physik Es sprechen Anton Zeilinger (Universität Wien) und Arno Rauschenbeutel (Johannes Gutenberg-Universität Mainz) Abstract: The simple Balmer spectrum of atomic hydrogen has provided the Rosetta stone for deciphering the strange laws of quantum physics during the early 20th century. Four decades ago, Doppler-free laser spectroscopy opened a new chapter in the exploration of hydrogen. Today, precision spectroscopy of hydrogen is reaching a precision of 15 decimal digits with the help of new spectroscopic tools including the laser frequency comb technique. However, the determination of fundamental constants and experimental tests of fundamental physics laws are now hindered by our insufficient knowledge of the rms charge radius of the proton. Recently, a laser measurement of the 2S-2P Lamb shift of muonic hydrogen has yielded an independent precise new value of the proton radius which differs by five old standard deviations from the official CODATA value. This discrepancy is subject of intense current discussions. It may be caused by a mistake, or it may indicate a dent in the armor of quantum electrodynamic theory. Theodor W. Hänsch ist Pionier der Laserspektroskopie und Nobelpreisträger für Physik des Jahres 2005. Er leitet das Max-Planck-Institut für Quantenoptik in Garching bei München. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Anton Zeilinger: Begrüßung 00:00:18 3. Arno Rauschenbeutel: Einführung 00:02:11 4. Historic remarks on the Balmer spectrum 00:03:37 5. Optical spectroscopy of hydrogen 00:13:16 7. The optical frequency comb 00:21:17 8. Measuring the frequency with a laser comb 00:31:58 9. The size of the proton 00:37:56 10. Muonic hydrogen resonance 00:43:20



  • Date:

    • [2011]
  • Period:

    • Early 21th century



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