March 2009 - Vip-all.phys - maillist.au.dk

[vip-all] No hot water - no heat
by Ruth Laursen 31 Mar '09

31 Mar '09

AKV will turn off the district heating on Thursday 2. April from: 7.000 - 18.00. So we will have: no heat and no hot water. Kind regards ruth *************************** Ruth Laursen Head of Administration Department of Physics and Astronomy Aarhus University Ny Munkegade 120 DK- 8000 Aarhus C Telephone: 8942 3706 Mobile: 2338 2335 Offce: 1522-212 e-mail: ruth(a)phys.au.dk

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[vip-all] FW: Vedr varme og varmt vand..
by Ruth Laursen 31 Mar '09

31 Mar '09

AKV lukker for fjernvarmen D. 2/4-09 kl ca. 07.00 til ca. kl 18.00 Det betyder ingen varme og ingen varmt vand Mvh. Jan Jacobsen Fysisk institut 28992035 From: Jan Jacobsen [mailto:TEKJAJ@adm.au.dk] Sent: 31. marts 2009 08:38 To: ruth(a)phys.au.dk Subject: Vedr varme og varmt vand..

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[vip-all] AMO seminar today
by Nicolai Nygaard 26 Mar '09

26 Mar '09

Speaker: Speaker: Lotte Holmegaard (Kemisk Institut, Aarhus Universitet) Title: Laser-induced alignment and orientation of quantum-state- selected molecules Time: Today, 15.15 to 16.00 Place: Aud. D1 at the Math Department Abstract: We demonstrate how an inhomogeneous static electric field can deflect a cold beam of polar molecules. The deflection spatially disperses the rotational quantum states of the molecules, enabling quantum-state selectivity. In particular, the ground state experiences the largest Stark shift and molecules residing in this state are deflected the most. The goal of our experiment is to isolate and use rotational ground- state molecules, or at least samples of molecules in the lowest-lying rotational states as targets for further experiments. So far we have obtained unprecedented strong degree of alignment (confinement of one or more molecular axes to the laboratory frame), induced by moderately intense laser pulses, as well as strong molecular orientation (directional confinement of the permanent dipole- moment of the molecule) induced by a mixed laser and static field. The prospect of confining an ensemble of molecules to the laboratory frame opens the door to various experimental studies from the molecule’s point of view. Especially we are interested in studying photoelectron angular distributions from aligned or oriented molecules. Peter Staanum and Nicolai Nygaard Nicolai Nygaard Institut for Fysik og Astronomi Aarhus Universitet Ny Munkegade 120, Bygn. 1520 (kontor 634) 8000 Århus C Denmark Telephone: +45 89 42 36 80 Fax: +45 86 12 07 40 Email: nygaard(a)phys.au.dk Web: www.phys.au.dk/~nygaard

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[vip-all] Foredrag under IFA's besøgsservice
by Helge Knudsen 25 Mar '09

25 Mar '09

Kære kollega, Som du ved har IFA en aktiv besøgsservice for gymnasieelever. Herunder udbyder vi en række spændende foredrag om forskellige emner: http://www.phys.au.dk/tilbud/foredrag.shtm Vi kan aldrig få nok af disse foredrag, så hvis du skulle have lyst, vil jeg meget gerne høre fra dig. Især hvis dit foredrag kunne bidrage til en større diversitet med hensyn til emner. Det drejer sig ikke om en stor belastning, idet de fleste udbydere kun holder et par foredrag om året. Mange hilsener, Helge Knudsen PS.: Du skal sende mig en kort beskrivelse af foredraget, som det du kan se ved at klikke på de enkelte foredrag på ovenstående www side. ___________________________________ Helge Knudsen Department of Physics and Astronomy Aarhus University Ny Munkegade 120 DK 8000 Aarhus C Denmark (+45) 8942 3607 ___________________________________

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[vip-all] Nordic Meeting - Danish Physical Society
by Helge Knudsen 23 Mar '09

23 Mar '09

Tilmeldingsfristen er udskudt til sidst i denne uge! The deadline has been changed to Friday 27 March. vh Helge ________________________________ Kære kollegaer, (English version below) Jeg minder om, at Dansk Fysisk Selskab afholder Årsmøde i dagene den 16. til 18. juni på DTU, Lyngby. Denne gang er årsmødet et fællesmøde for de Nordiske Fysiske Selskaber. Du kan finde en reklame - med liste over plenarforedrag - på opslagstavlerne eller på http://dfs.nbi.dk/aarsmoeder/2009/aarsmoede.php BEMÆRK: Dine specialestuderende kan søge friplads og hoteludgift ved DFS og da IFA betaler deres bustransport, kan de få to dage i København med stribevis af interessante fysikforedrag GRATIS (de skal bare være medlem af DFS, og det koster kun 150 kroner om året). Sidste år fik alle, der ansøgte, bevilget friplads og overnatning! NETVÆRK: Dette er en super chance for at møde dine kolleger fra de andre danske og nordiske universiteter og industrien. BIDRAG: Du opfordres til at indsende et bidrag til en af de videnskabelige mundtlige eller poster sessioner. DEADLINE: Tilmelding inden 20. marts, hvis du vil indsende et konferencebidrag (eller hvis dine studerende vil søge friplads). KONFERENCEGEBYR: 150 EURO for DFS medlemmer. BUSTRANSPORT: Med støtte fra IFA: 500 Dkr. Tilmeld dig på listen i receptionen senest 8. juni og betal ved samme lejlighed. MVH Helge Knudsen DFS kasserer ************************************************ Dear colleagues, The annual meeting in the Danish Physical Society is an excellent opportunity to get an overview of the activities in the fields of physics and astronomy in Denmark. The next meeting will be held 16. 18. June 2009 at the Danish Technical University, Copenhagen. <http://dfs.nbi.dk/aarsmoeder/2009/aarsmoede.php> http://dfs.nbi.dk/aarsmoeder/2009/aarsmoede.php This year the meeting will be held together with the Physical Societies of the other Nordic countries, even further broadening the scope. Deadline for registration and abstracts: March 20. Joint bus transport from the University of Aarhus to the conference site (and back) is provided with support from the Department (IFA) for 500 Dkr. You are kindly requested to put your name on the list for transportation which is situated in the reception and to pay the 500 Dkr at the same time - at the latest June 8. Sincerely Helge Knudsen (Board member in the Danish Physical Society) ___________________________________ Helge Knudsen Department of Physics and Astronomy Aarhus University Ny Munkegade 120 DK 8000 Aarhus C Denmark (+45) 8942 3607 ___________________________________

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[vip-all] NO COOLING WATER ON MONDAY MORNING
by Ivan Stensgaard 18 Mar '09

18 Mar '09

Dear all, Due to a necessary revision of the control setup for the cooling-water system caused by addition of the new Mars project, there will be NO COOLINGWATER IN BUILDINGS 1522, 1524 and 1525 Monday 23rd of March from 07.00 to 08.00. Best regards Ivan ----------------------------------------------------------------- Prof. Ivan Stensgaard, Head of Department, Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark, Telph: +45 8942 3715, Mobile: +45 2338 2322

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[vip-all] FTP information meeting, March 19th at 15.00-16.30 in Fys Aud
by Ivan Stensgaard 17 Mar '09

17 Mar '09

Dear IFA VIP The management committee of The Danish Research Council for Technology and Production Sciences (FTP) is visiting the Faculty of Science on Thursday March 19th. In conjunction with this, the head of the FTP board, Marcel Somers, has organized an information meeting in Fys Aud at 15.00-16.30. Potential applicants for FTP grants are most welcome. Best regards, Ivan ----------------------------------------------------------------- Prof. Ivan Stensgaard, Head of Department, Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark, Telph: +45 8942 3715, Mobile: +45 2338 2322

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[vip-all] Gerry/Knight: Introductoryquantum optics
by Liv Vego 16 Mar '09

16 Mar '09

The following book is missing from the library: The book is requested, so if you know where it is, please return it to the library office Opstilling Monografier Gerry Titel Introductory quantum optics Forfatter/ed. Gerry, C. C. Knight, Peter Impressum Cambridge : Cambridge University Press, 2004 Beskrivelse , 317 s. , ill. -- --------------------------------------------------- Liv Vego Phone: +45 8942 3618/1111 Physics & Astronomy Library, Fax: +45 8612 0740 Department of Physics and Astronomy University of Aarhus, Ny Munkegade DK 8000 Aarhus C, Denmark, Email: livvego(a)phys.au.dk --------------------------------------------------- http://www.phys.au.dk/library/bibliotek-uk.shtm ---------------------------------------------------

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[vip-all] AMO seminar today at 11.30: Highly charged ions guided in insulating nanocapillaries
by Peter Staanum 13 Mar '09

13 Mar '09

Speaker: Nico Stolterfoht, Hahn-Meitner-Institut Berlin GmbH, Germany Title: Highly charged ions guided in insulating nanocapillaries Time: Friday, March 13, 11:30-12:30 Place: Fysisk Auditorium Abstract In past few years we performed experiments in which slow highly charged ions are transmitted through capillaries of 100-200 nm diameter and 10 ?m length in a highly insulating Polyethylene Terephthalate (PET) foil. We found that the majority of the transmitted particles preserve their charge state during the passage through the nanocapillaries even when the capillary axis is tilted with respect to the incident beam. This behavior strikingly differs from the transmission of highly charged ions through capillaries in metals studied previously. For insulating PET the angular distributions of the ions have a maximum equal to the tilt angle indicating a ?guiding? of the ions within the capillary. This observation is surprising, since highly charged ions are neutralized with high probability when scattered at the surface in obvious contradiction to the ion guiding results. In the talk the basic mechanisms of ion guiding will be introduced. Moreover, examples for new developments will be given. Scaling laws of guiding for varying energy and charge state of the projectile will presented. Dynamic properties will be discussed in terms of temporary charge patches within the capillaries and visualized by animations of theoretical and experimental results. Peter Staanum and Nicolai Nygaard Coffee, tea and bread rolls will be served at 11.15 ---------------------------------- Peter Frøhlich Staanum Department of Physics and Astronomy University of Aarhus Ny Munkegade 120 8000 Aarhus C Denmark Phone: (+45) 8942 3602 Fax: (+45) 8612 0740 VAT Nr.: DK16562777 EAN Nr.: 5798000419872 ----------------------------------

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[vip-all] AMO seminar today
by Nicolai Nygaard 12 Mar '09

12 Mar '09

Speaker: Jens Ulrik Andersen (IFA) Title: Crystal-blocking picoscope: Measurement of recoils in heavy-ion induced fission Time: Today, 15.15 to 16.00 Place: Fysisk Auditorium Abstract: Channeling and blocking of energetic charged particles in crystals was a hot topic when I was a student about 40 years ago. At that time, Jens Lindhard was professor in theoretical physics, and he created the basic theoretical framework for a description of what he called “the string effect” [1]. This effect can be observed, for example, in nuclear fission induced by ion bombardment of a crystal. If a fission fragment moves in the direction of a “string” of atoms it is blocked by collisions with atoms on the string. This leads to strong dips in intensity in directions of major crystallographic axes. The string effect can be applied to measure lifetimes in nuclear reactions. If a fission reaction proceeds via formation of a compound nucleus, as argued by Bohr and Wheeler in a famous paper from 1939 [2], and this nucleus lives for a time τ, it will be displaced from its crystal site by a distance vτ before fission, where v is the recoil velocity. The blocking is sensitive to very small displacements, vτ~10-100 pm, and for this reason I have called our experimental set-up a picoscope. I shall report on very recent measurements of fission lifetimes at Oak Ridge Natl. Labs [3]. Our purpose was to study the fission dynamics for hot nuclei with a very high atomic number, Z≥96. The measured lifetimes of 1-2 attoseconds are surprisingly long and are inconsistent with the Bohr-Wheeler model. They support a picture of strongly damped quasi-fission: the nucleus behaves like a drop of syrup. 1) J. Lindhard, K. Dan. Vid. Selsk. Mat. Fys. Medd. Dan. Vid. Selsk. 34, No. 14 (1965). 2) N. Bohr and J.A. Wheeler, Phys. Rev. 56, 426 (1939). 3) J.U. Andersen, J. Chevallier, J.S. Forster, S.A. Karamian, C.R. Vane, J.R. Beene, A. Galindo-Uribarri, J. Gomez del Campo, C.J. Gross, H.F. Krause, E. Padilla-Rodal, D. Radford, D. Shapira, C. Broude, F. Malaguti, and A. Uguzzoni, Phys. Rev. C 78, 064609 (2008). Peter Staanum and Nicolai Nygaard

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