Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Flash-freezing of molecular ions in a storage ring

30.06.2009
Rapid rotational cooling of molecular ions by interaction with electrons has been observed for the first time in the TSR heavy ion storage ring of the Max Planck Institute for Nuclear Physics in Heidelberg.

This kind of laboratory astrophysics helps to understand in more detail the physical and chemical properties of cold interstellar matter.

The interaction of molecular ions with free electrons is of key importance to understand the physical and chemical properties of cold astrophysical environments like interstellar molecular clouds. Whereas electron-ion recombination has been studied in great detail in storage ring and ion trap experiments in the last two decades, information about the exchange of energy between slow electrons and the internal motion (rotation and vibration) of molecular ions was rather limited.

Researchers of the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg, of the Weizmann Institute of Science in Rehovot (Israel) and of three other collaborating institutions have now published first quantitative results for fast electron cooling of rotating singly charged HD molecular ions. In the TSR heavy ion storage ring of the MPIK an HD molecular ion beam was merged with cold electrons of 33 K (-240°C) temperature, i. e. 33 degrees above absolute zero.

The interaction with the electrons reduced the rotational temperature of the ions from initially about 1200°C to -150°C within only 8 seconds and stabilized it at this low value in the simultaneously acting thermal radiation field at the ambient room temperature (300 K). During the process, the ions pass the electron cooling bath about 175000 times per second. The cooling due to so-called superelastic collisions, where some amount of energy is transferred from the rotational motion of the ion to linear motion of the electron, is well described by theoretical calculations initiated through this experiment.

Contact:

Prof. Dr. Andreas Wolf
Max Planck Institute for Nuclear Physics, Heidelberg
Phone: (+49)6221-516-503
Fax: (+49)6221-516-852
E-mail: andreas.wolf@mpi-hd.mpg.de
Prof. Dr. Daniel Zajfman
Weizmann Institute of Science, Rehovot, Israel
Phone: (+972)8-934-3951
Fax: (+972)8-934-4100
E-mail: daniel.zajfman@weizmann.ac.il
Weitere Informationen:
http://link.aps.org/doi/10.1103/PhysRevLett.102.223202 Orginal publication
http://www.mpi-hd.mpg.de/blaum/members/molecular-qd/index.en.html Group of Prof. Andreas Wolf

http://www.weizmann.ac.il/particle/molecule/ Group of Prof. Daniel Zajfman

Dr. Bernold Feuerstein | Max-Planck-Institut
Further information:
http://www.weizmann.ac.il
http://www.mpi-hd.mpg.de

More articles from Physics and Astronomy:

nachricht Space radiation won't stop NASA's human exploration
18.10.2017 | NASA/Johnson Space Center

nachricht Study shows how water could have flowed on 'cold and icy' ancient Mars
18.10.2017 | Brown University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Osaka university researchers make the slipperiest surfaces adhesive

18.10.2017 | Materials Sciences

Space radiation won't stop NASA's human exploration

18.10.2017 | Physics and Astronomy

Los Alamos researchers and supercomputers help interpret the latest LIGO findings

18.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>