Profiles

Henning Schmidt

Henning Schmidt

Professor

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Arbetar vid Fysikum
Telefon 08-553 786 43
E-post schmidt@fysik.su.se
Besöksadress Roslagstullsbacken 21 C, plan 4, Albano
Rum C4:3015
Postadress AlbaNova universitetscentrum, Fysikum 106 91 Stockholm

Om mig

Jag kommer från Danmark och jag tog min doktorsexamen vid Aarhus universitet 1994 efter at under min doktorandtid ha jobbat ett halvår vid Max-Planckk Institut für Kernphysik i Heidelberg. Jag flyttade december 1995 till Stockholm då jag här hade fått en postdoktorstjänst. 1998 fick jag en forskarassistenttjänst, 2006 blev jag lektor och 2011 befordrades jag till professor.

Publikationer

I urval från Stockholms universitets publikationsdatabas
  • 2017. Henning T. Schmidt (et al.). Physical Review Letters 119 (7)

    We apply near-threshold laser photodetachment to characterize the rotational quantum level distribution of OH- ions stored in the cryogenic ion-beam storage ring DESIREE at Stockholm University. We find that the stored ions relax to a rotational temperature of 13.4 +/- 0.2 K with 94.9 +/- 0.3% of the ions in the rotational ground state. This is consistent with the storage ring temperature of 13.5 +/- 0.5 K as measured with eight silicon diodes but in contrast to all earlier studies in cryogenic traps and rings where the rotational temperatures were always much higher than those of the storage devices at their lowest temperatures. Furthermore, we actively modify the rotational distribution through selective photodetachment to produce an OH- beam where 99.1 +/- 0.1% of approximately one million stored ions are in the J = 0 rotational ground state. We measure the intrinsic lifetime of the J = 1 rotational level to be 145 +/- 28 s.

  • 2015. Henning T. Schmidt. Physica Scripta T166

    A significant number of electrostatic ion-storage rings have been built since the late 1990s or are currently in their construction or commisioning phases. In this short contribution, we attempt to supply an overview of these different facilities, while we also mention a selection of the electrostatic ion-beam traps that has been developed through the same time period and by some of the same research groups.

  • 2015. Erik Bäckström (et al.). Physical Review Letters 114 (14)

    We use a novel electrostatic ion storage ring to measure the radiative lifetime of the upper level in the 3p 5  P 2  o 1/2 →3p 5  P 2  o 3/2   spontaneous radiative decay in S −  32   to be 503±54  sec . This is by orders of magnitude the longest lifetime ever measured in a negatively charged ion. Cryogenic cooling of the storage ring gives a residual-gas pressure of a few times 10 −14   mbar at 13 K and storage of 10 keV sulfur anions for more than an hour. Our experimental results differ by 1.3σ  from the only available theoretical prediction.

Visa alla publikationer av Henning Schmidt vid Stockholms universitet

Senast uppdaterad: 18 juli 2018

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