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style="FONT-FAMILY: 'Century Gothic'; COLOR: #5f5f5f; mso-ansi-language: PL"
lang=PL>Institut za fiziku, Bijenička cesta 46,<o:p></o:p></SPAN></B></P>
<P style="TEXT-ALIGN: center; MARGIN: 3pt 0cm" class=MsoNormal
align=center><B style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #5f5f5f; mso-ansi-language: PL"
lang=PL>predavaonica u zgradi Mladen Paić<o:p></o:p></SPAN></B></P>
<P style="TEXT-ALIGN: center; MARGIN: 3.1pt 0cm" align=center><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #993300; FONT-SIZE: 14pt; mso-ansi-language: FR"
lang=FR>srijeda, 15. lipnja 2016., u 15:00 sati</SPAN></B><SPAN
style="FONT-FAMILY: 'Century Gothic'; mso-ansi-language: FR"
lang=FR><o:p></o:p></SPAN></P></TD></TR>
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<TD
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style="COLOR: #55913c; FONT-SIZE: 16pt; mso-ansi-language: FR; mso-bidi-font-size: 12.0pt"
lang=FR>Ultra cold beam: electrons/ions/atoms/molecules
</SPAN></B><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #559132; FONT-SIZE: 16pt; mso-ansi-language: FR; mso-bidi-font-size: 12.0pt"
lang=FR><o:p></o:p></SPAN></B></FONT></P></TD></TR>
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<P style="TEXT-ALIGN: center; MARGIN: 5.95pt 0cm 0pt"
align=center><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; FONT-SIZE: 14pt; mso-ansi-language: FR; mso-bidi-font-size: 13.5pt"
lang=FR>Dr. Daniel Comparat <o:p></o:p></SPAN></B></P></TD></TR>
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style="FONT-FAMILY: 'Century Gothic'; mso-ansi-language: FR; mso-bidi-font-weight: bold; mso-bidi-font-family: 'Times New Roman'"
lang=FR><o:p> </o:p></SPAN></P>
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align=center><B style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #181512; FONT-SIZE: 11pt; mso-ansi-language: FR; mso-fareast-language: ZH-CN"
lang=FR>Laboratoire Aimé Cotton, Orsay, FRANCE</SPAN></B><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; FONT-SIZE: 11pt; mso-ansi-language: FR"
lang=FR><o:p></o:p></SPAN></B></P>
<P style="TEXT-ALIGN: center; MARGIN: 5.95pt 0cm 0pt"
align=center><B><I><SPAN
style="FONT-FAMILY: 'Century Gothic'; FONT-SIZE: 11pt; mso-ansi-language: FR; mso-bidi-font-size: 12.0pt"
lang=FR>E-mail: <A
href="mailto:Daniel.Comparat@u-psud.fr">Daniel.Comparat@u-psud.fr</A><o:p></o:p></SPAN></I></B></P></TD></TR>
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style="FONT-FAMILY: 'Century Gothic'; mso-ansi-language: HR"
lang=HR><o:p> </o:p></SPAN></B></P>
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class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #181512" lang=EN-GB>Standard
electron sources have all energy spread above 0.3 eV. On the contrary, the
initial electron energy dispersion obtained from a Magneto-Optical Trap
for cold atoms, is in the 10 <?xml:namespace prefix = st1 ns =
"urn:schemas-microsoft-com:office:smarttags" /><st1:State
w:st="on"><st1:place w:st="on">neV</st1:place></st1:State> range. Thus, by
ionizing cold atoms we expect to realize a bright and monoenergetic
electron source. Based on an atomic beam, or on a standard 3D optical
cooling, our cesium cold atom source is ionized either by a continuous or
a pulsed laser. We study the behavior of the electron beam produced using
time of flight or velocity imaging methods. The main idea is to combine
this novel low energy highly monochromatic electron source with an
Electron Controlled Chemical Lithography experiment and with 3D and energy
resolved photoemission electron microscope (k-PEEM, from <st1:place
w:st="on"><st1:City w:st="on">Mainz University</st1:City>,
<st1:country-region w:st="on">Germany</st1:country-region></st1:place>).
This unique combination should allow focusing monoenergetic (~1 meV) and
very low electron energy (1-10 eV) down to unprecedented nanometer spots.
The exclusive injection and diagnostic microscope, with such high spatial
and energy resolution, will open the way towards controlled chemical
reactions at the molecular level. During this presentation we will mainly
explain the status of the experimental setup and details of the ionization
process which involves electric field ionization of the excited cold
atoms. <o:p></o:p></SPAN></B></P>
<P
style="TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt; mso-pagination: none; mso-layout-grid-align: none"
class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #181512"
lang=EN-GB><o:p> </o:p></SPAN></B></P>
<P
style="TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt; mso-pagination: none; mso-layout-grid-align: none"
class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: #181512" lang=EN-GB>An
extension of this work involves molecules. Indeed, cooling and trapping of
molecules at ultracold temperatures (<1 mK) have been the most
challenging tasks in experimental quantum physics for the last decade. A
breakthrough in this field would give access to new quantum chemistry,
studies of collective effects, metrology of fundamental constants, etc.
Unfortunately, the successful laser cooling technique is rarely helpful in
this context. Therefore, direct cooling of molecules is generally based on
super-sonic expansion, cryogenic, or velocity filtering. All these methods
suffer from the fact that they produce cold sample of molecules moving at
velocities of couple of hundred meters per second. Thus, the problem to be
solved is finding the way to stop molecules in the laboratory frame.
Nowadays, many experiments use electromagnetic decelerators acting on the
electric or magnetic permanent molecular dipole moment. Though successful,
those methods have many drawbacks, such as high losses, cumbersome
apparatus, etc. We have proposed a new approach that combines electrical
charging of cooled neutral molecules, decelerating the resulting anions
over short distances and, finally, removing the extra electron by
photo-detachment. If such approach turns out to be successful, it will be
a very important result for the cold molecule community. In medium-term
perspective, we consider some “applications” of this method, such as
violation parity measurement, creation of cold ion sources with the view
of surface doping (NV centers in diamond, for example),
etc.<o:p></o:p></SPAN></B></P>
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style="FONT-FAMILY: 'Century Gothic'"
lang=EN-GB><o:p> </o:p></SPAN></B></P></TD></TR>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; FONT-SIZE: 11pt; mso-ansi-language: HR; mso-bidi-font-size: 12.0pt"
lang=HR><o:p> </o:p></SPAN></B></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; FONT-SIZE: 11pt; mso-ansi-language: NO-BOK; mso-bidi-font-size: 12.0pt"
lang=NO-BOK>Voditelji seminara IF-a: </SPAN></B><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: black; FONT-SIZE: 11pt"
lang=EN-GB><A href="mailto:natasav@ifs.hr" target=_blank><SPAN
style="mso-ansi-language: NO-BOK" lang=NO-BOK>Nataša
Vujičić</SPAN></A></SPAN></B><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: black; FONT-SIZE: 11pt; mso-ansi-language: NO-BOK"
lang=NO-BOK> i </SPAN></B><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; COLOR: black; FONT-SIZE: 11pt"
lang=EN-GB><A href="mailto:damirs@ifs.hr" target=_blank><SPAN
style="mso-ansi-language: NO-BOK" lang=NO-BOK>Damir
Starešinić</SPAN></A></SPAN></B><B><SPAN
style="FONT-FAMILY: 'Century Gothic'; FONT-SIZE: 10pt; mso-ansi-language: NO-BOK; mso-bidi-font-size: 12.0pt"
lang=EN-GB> </SPAN></B><SPAN style="mso-ansi-language: NO-BOK"
lang=NO-BOK><o:p></o:p></SPAN></P>
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