<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Welcome<br><br><div>Angela & Jorrit</div><div><br>On 6 Mar 2018, at 17:48, Angela Adamo <<a href="mailto:angela.adamo@astro.su.se">angela.adamo@astro.su.se</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div class="">Dear all,</div>
<div class="">welcome to the next astronomy seminar, Friday 9th of March at 10:30 in FC61.</div>
<div class="">The speaker of this week is Dr. Nathalie de Ruette from Fysikum, SU.</div>
<div class="">Title and abstract are below together with an updated spring agenda.</div>
<div class=""><br class="">
</div>
<div class="">Welcome,</div>
<div class="">Angela & Jorrit</div>
<div class=""><br class="">
</div>
<br class="">
<b class="">Formation and Destruction Mechanisms of Atomic and Molecular Ions of Astrophysical Interest.</b><br class="">
<br class="">
The chain of chemical reactions leading towards life is thought to begin in molecular clouds when carbon atoms are fixed into molecules, initiating the synthesis of complex organic species. Up to 20 % of the cosmic carbon is believed to be in the form of Polycyclic
Aromatic Hydrocarbons. Anions also play crucial roles in a range of astrophysical environments and planetary atmospheres. How large molecules and anions can survive and evolve in harsh environments, such as in planetary nebulae with strong UV radiation fields
or in shock-heated outflows of supernovae is still not fully understood. Spectroscopic observations, combined with sophisticated astrochemical models to interpret the collected spectra, provide much of our knowledge of these processes. However, few reactions
have been studied experimentally in a range of collision energies relevant for cold astrophysical environments. Uncertainties in the underlying chemical data in these models limit our understanding of the molecular universe.<br class="">
In this talk, I will present some key reactions for the abundances of chemical compounds and the ionization balance in various astrophysical environments, and show results of experiments performed at DESIREE facility in Stockholm University and elsewhere to
address some of these issues. Several methods used in these experiments will be briefly presented including the merged beams method and collision induced dissociation. Our reaction studies will help to provide a better basis for astrochemical models and benchmarks
for future theoretical development.<br class="">
<br class="">
<div class="">16/03 <span style="color: rgb(69, 69, 69);" class="">Hanindyo Kuncarayakti<br class="">
</span>23/03 Florent Renaud</div>
30/03 Easter break<br class="">
06/04 Nina Almgren<br class="">
13/04 Jim Dale<br class="">
20/04 Brent Groves<br class="">
27/04 Mickaël Bonnefoy<br class="">
04/05 Sara Bladh<br class="">
11/05 Klämdag<br class="">
18/05 Anastasia Fialkov<br class="">
25/05 Carolina Robustini<br class="">
01/06 Catherine Watkinson<br class="">
08/06 Esha Kundu<br class="">
15/06 Matteo Messa<br class="">
22/06 Midsommar<br class="">
29/06 Summer break
<div class="">-------------------------------------------------------<br class="">
Angela Adamo <br class="">
<br class="">
Department of Astronomy<br class="">
Stockholm University and Oskar Klein Centre<br class="">
SE-10691 Stockholm - Sweden<br class="">
tel: +46 (0)8 5537 8556 <br class="">
email: <a href="mailto:angela.adamo@astro.su.se" class="">angela.adamo@astro.su.se</a><br class="">
<a href="http://ttt.astro.su.se/~adamo" class="">http://ttt.astro.su.se/~adamo</a><br class="">
------------------------------------------------------- </div>
<br class="">
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