<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div><br></div><div style="text-align: center;"><img src="cid:d6c976c53b16747fdefa7ca63a171c2cda478b87@zimbra" data-mce-src="cid:d6c976c53b16747fdefa7ca63a171c2cda478b87@zimbra"></div><div style="text-align: center;"><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;" data-mce-style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;">Institut za fiziku, Bijenička cesta 46,</span></b></p><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;" data-mce-style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;">predavaonica u zgradi Mladen Paić</span></b></p><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif; color: #993300;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif; color: #993300;">utorak, 24. ožujka 2015., u 15:00 sati</span></b></div><div style="text-align: center;"><b><br></b></div><div style="text-align: center;"><b><br></b></div><div style="text-align: center;"><b><b><span lang="EN-GB" style="font-size: 16.0pt; font-family: 'Times New Roman',serif; color: #55913c;" data-mce-style="font-size: 16.0pt; font-family: 'Times New Roman',serif; color: #55913c;">Precision Spectroscopy of Atomic Hydrogen</span></b></b></div><div style="text-align: center;"></div><div style="text-align: center;"><br></div><div style="text-align: center;"><br></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;">Dr. </span><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;">Sc. Thomas Udem</span><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"></span></b></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;" data-mce-style="text-align: center;"><b><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"></span></b></b><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;">Max-Planck-Institut für Quantenoptik, Garching </span></b></p><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><b><i><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;">E-mail: <span style="color: blue;" data-mce-style="color: blue;">thomas.udem@mpq.mpg.de<span class="object"><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;"></span></span></span></span></i></b><br></span></b></div><div style="text-align: center;" data-mce-style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: left;"><b><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"></span></b></b><p style="text-align: justify; margin: 0px;" data-mce-style="text-align: justify; margin: 0px;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;">Precise determination of transition frequencies of simple atomic systems are required for a number of fundamental applications such as tests of quantum electrodynamics (QED), the determination of fundamental constants and nuclear charge radii. The sharpest transition in atomic hydrogen occurs between the metastable 2S state and the 1S ground state. Its transition frequency has now been measured with almost 15 digits accuracy using an optical frequency comb and a cesium atomic clock as a reference. A recent measurement of the Lamb shift in muonic hydrogen is in significant contradiction to the hydrogen data if QED calculations are assumed to be correct. We hope to contribute to the resolution of this so called "proton size puzzle" by providing additional experimental input from the hydrogen side.</span></b></p><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><b><i><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;"><a href="http://www.mpq.mpg.de">http://www.mpq.mpg.de</a></span></i></b><br></span></b></div><div style="text-align: left;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><b><i><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></i></b></span></b></div><div style="text-align: left;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><b><i><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></i></b></span></b></div><div style="text-align: center;" data-mce-style="text-align: center;"><b><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"></span></b></b><p style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;">Voditelji seminara IF-a: Nikša Krstulović i Osor Bari</span></b><b><span style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;">šić</span></b><b><span style="font-size: 10.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 10.0pt; font-family: 'Century Gothic',sans-serif;"></span></b></p><b><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"></span></b></b><p style="margin: 0px;" data-mce-style="margin: 0px;"><b><span style="font-size: 10.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 10.0pt; font-family: 'Century Gothic',sans-serif;"> </span></b><span lang="EN-GB"></span></p><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;"><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></div><div style="text-align: center;"><br></div><div style="text-align: center;"><br></div><div><br></div><div><span name="x"></span>*************************<br>Nikša Krstulović, PhD<br>Research associate<p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic',sans-serif;"><br></span></b></p>Institute of Physics<br>Bijenicka 46<br>HR-10000 Zagreb, Croatia<br><div><br></div>Phone: 00385 1 4698 872<br> 00385 1 4698 851<br>Fax: 00385 1 4698 889<br><div><br></div>http://www.ifs.hr/<br>http://spectra.ifs.hr/<br>**************************<br><div><br></div><span name="x"></span></div></div></body></html>