Supercool helium ions make their debut - GoFuckYourself.com

Juicy D. Links · 01-30-2005, 11:36 AM

http://physicsweb.org/articles/news/8/12/11/1

Supercool helium ions make their debut
20 December 2004

Physicists in Germany have produced large numbers of ultracold helium ions for the first time. The helium ions could be used to search for variations in the values of the fundamental constants and to test various effects in quantum electrodynamics (QED).

Established laser cooling techniques do not work for helium so Stephan Schiller and colleagues at Heinrich-Heine University in Düsseldorf had to use a technique called "sympathetic cooling" instead. This involved cooling the ions with a gas of beryllium ions that had already been cooled with lasers (B Roth et al. 2004 arXiv.org/abs/physics/0412053).

Be-He crystal
Schiller and co-workers began by loading large numbers of beryllium-9 ions, produced by electron impact ionisation, into a linear radio-frequency trap. An ultraviolet laser was then used to cool these ions until they underwent a phase transition from the fluid state to an ordered phase known as a "Coulomb crystal".

Next, they loaded the helium-4 ions -- which had also been generated by electron impact ionisation -- into the trap. A dark core of ultracold helium ions was observed in the centre of the beryllium ion crystal. Schiller and co-workers were able to cool as many as 150 helium ions to a temperature of about 20 millikelvin.

The team has also demonstrated sympathetic cooling with helium-3 ions and is now applying the technique to other species, including diatomic molecules made of hydrogen and deuterium.

"Helium ions are important for measurements of the fundamental constants and tests of QED because they are complementary to hydrogen," team member Bernhard Roth told PhysicsWeb. "Using cold ensembles of HD+ ions we hope to measure the ratio of the electron to the proton mass, and test if it remains constant over time."

gangbangjoe · 01-30-2005, 11:37 AM

is it physics week ?

MattO · 01-30-2005, 11:43 AM

Damn that's cold

LoveHenk · 01-30-2005, 01:00 PM

why post links with intellectual content that is not interpretable by 99% of gfy visitors. including u juicy

01-30-2005, 11:36 AM	#1
Juicy D. Links So Fucking Banned Industry Role: Join Date: Apr 2001 Location: N.Y. -Long Island -- Posts: 122,992	Supercool helium ions make their debut http://physicsweb.org/articles/news/8/12/11/1 Supercool helium ions make their debut 20 December 2004 Physicists in Germany have produced large numbers of ultracold helium ions for the first time. The helium ions could be used to search for variations in the values of the fundamental constants and to test various effects in quantum electrodynamics (QED). Established laser cooling techniques do not work for helium so Stephan Schiller and colleagues at Heinrich-Heine University in Düsseldorf had to use a technique called "sympathetic cooling" instead. This involved cooling the ions with a gas of beryllium ions that had already been cooled with lasers (B Roth et al. 2004 arXiv.org/abs/physics/0412053). Be-He crystal Schiller and co-workers began by loading large numbers of beryllium-9 ions, produced by electron impact ionisation, into a linear radio-frequency trap. An ultraviolet laser was then used to cool these ions until they underwent a phase transition from the fluid state to an ordered phase known as a "Coulomb crystal". Next, they loaded the helium-4 ions -- which had also been generated by electron impact ionisation -- into the trap. A dark core of ultracold helium ions was observed in the centre of the beryllium ion crystal. Schiller and co-workers were able to cool as many as 150 helium ions to a temperature of about 20 millikelvin. The team has also demonstrated sympathetic cooling with helium-3 ions and is now applying the technique to other species, including diatomic molecules made of hydrogen and deuterium. "Helium ions are important for measurements of the fundamental constants and tests of QED because they are complementary to hydrogen," team member Bernhard Roth told PhysicsWeb. "Using cold ensembles of HD+ ions we hope to measure the ratio of the electron to the proton mass, and test if it remains constant over time."

01-30-2005, 11:37 AM	#2
gangbangjoe Ronin Join Date: May 2004 Location: Live by the code Die by the code Posts: 17,693	is it physics week ? __________________ NichePay - $30 on all trials - Killer Ratios .................................................. Female Ejaculation - Hairy - Shemale Puffy Nipples - Huge Clits - And More! ..................................................

01-30-2005, 11:43 AM	#3
MattO The O is for Oohhh Join Date: Feb 2003 Location: AUSTIN TEJAS Posts: 10,861	Damn that's cold

01-30-2005, 01:00 PM	#4
LoveHenk Confirmed User Join Date: May 2004 Location: Netherlands Posts: 308	why post links with intellectual content that is not interpretable by 99% of gfy visitors. including u juicy