First Test of New X-ray Laser Strips Neon Bare

September 18, 2009 by Shawne Workman,
The main experimental chamber of the AMO instrument, the high-field physics end-station. Here, a gas jet sends pulses of sample gas into the chamber where it will be ionized by X-rays from the LCLS. The results are detected by several spectrometers arrayed around the central interaction region. Read more in the AMO Technical Specifications. (Image: SLAC Infomedia Solutions.)

( -- It takes a lot of energy to strip all ten electrons from an atom of neon. Doing it from the inside out, knocking away the most-closely-held, innermost electrons first, is an even rarer feat. But the brilliant X-ray pulses of the Linac Coherent Light Source have done just that, in the successful first test of the unprecedented X-ray laser with its first scientific instrument. The result demonstrates the machine's unique capabilities—with the world's brightest and shortest X-ray laser pulses—and marks the first of two milestones in readiness for the launch of LCLS scientific user experiments this October.

Early on September 12, scientists at the Department of Energy's SLAC National Accelerator Laboratory introduced puffs of neon gas into the sample chamber of the LCLS Atomic, Molecular and Optical science instrument. The AMO instrument's ion detector picked up showers of positively-charged neon nuclei—where the charge indicates the number of missing -- ranging from partially to fully ionized. The scientists were able to adjust the proportion of different neon species, from non-ionized Ne (no missing electrons) to Ne10+, lacking all 10 electrons, by fine-tuning the powerful LCLS X-ray beam.

"This truly shows we're reaching a new regime with the LCLS, to access physics that's never been available before," said instrument scientist John Bozek, who has spent the past 3.5 years planning and developing the AMO instrument.

"We're making Ne10+ in a new way, removing electrons from the inside-out," Bozek said. He noted that fully-ionized neon has been achieved before, using optical-wavelength lasers and starting with the outer-most electrons, which are less affected by the atomic nucleus's strong pull. Last weekend's result at SLAC marks the first time it's been done using the high-energies of X-rays, and from the inside moving outward.

First Test of New X-ray Laser Strips Neon Bare
The first of six LCLS experimental instruments, the AMO instrument is located in one of two experimental halls at the end of SLAC's 2-mile linear accelerator. (Image: SLAC Infomedia Solutions.)

The LCLS and AMO teams, including Bozek and co-AMO instrument scientist Christoph Bostedt, are using the neon gas experiment as a tool for instrument commissioning—tuning and calibrating both the LCLS X-ray beam and the AMO instrument controls and optics. Several future AMO scientific users, who submitted successful proposals to perform experiments later this year, are at SLAC now, learning to use the machine and providing valuable guidance. Their input will help the SLAC AMO team tune the instrument to best meet users' experimental needs.

The AMO instrument was designed to explore the interaction of the LCLS's intense X-ray pulses with atoms and molecules, to gain an understanding of how their electronic structure responds. Ultrashort X-ray pulses from the LCLS also offer the opportunity to follow the evolution of chemical reactions on their natural time scales.

"The AMO instrument was built to do two things: explore high-intensity physics, and to examine time-resolved physics of atoms, molecules and clusters of molecules," Bozek said. "We've demonstrated that the first is accessible. Hopefully within a week or two, we'll demonstrate the other as well."

Bozek and his colleagues will test the instrument’s ability to resolve extremely fast molecular events later this month. The researchers will use an infrared laser to stimulate a sample material, creating molecular change or motion to be captured using the LCLS's X-ray laser pulses and the AMO instrument. Due to the extremely brief duration of each LCLS pulse, these "pump-probe" tests could resolve molecular motions over periods as short as 100 femtoseconds, Bozek said. Those tests will complete commissioning of the AMO instrument for the launch of LCLS scientific work October 1.

"The LCLS beam and AMO instrument have performed exactly as designed," said LCLS Director Joachim Stöhr. "It's a testament to the whole LCLS team that they produced these beautiful results on the first go, with first X-ray lasing last spring and now AMO operations. We look forward to seeing the fully-commissioned AMO instrument at work in the first LCLS scientific user experiments next month."

Provided by SLAC National Accelerator Laboratory (news : web)

Explore further: World's First Hard X-ray Laser Achieves 'First Light'

Related Stories

World's First Hard X-ray Laser Achieves 'First Light'

April 21, 2009

( -- The world's brightest X-ray source sprang to life last week at the U.S. Department of Energy's SLAC National Accelerator Laboratory. The Linac Coherent Light Source (LCLS) offers researchers the first-ever ...

Free Electron Lasers and You: An LCLS Primer

December 5, 2008

( -- In a few short months, the Linac Coherent Light Source will start operation as the world's first hard X-ray free electron laser, pushing SLAC National Accelerator Laboratory to the frontier of photon science. ...

FLASH Imaging Redux: Nano-Cinema is Born

July 8, 2008

Flash imaging of nanoscale objects undergoing ultrafast changes is now a technical possibility, according to a recent paper published in the June 22 edition of Nature Photonics. The results are a direct precursor to research ...

Sensing the Energy: Calibrating the LCLS

October 1, 2008

The Linac Coherent Light Source will generate X-rays 10 billion times brighter than any source before it. Being the first of its kind, the LCLS has presented engineers with a number of unique technical hurdles. Measuring ...

LCLS Beam Already in Action

August 6, 2007

The Near and Far Experimental halls are still under construction, but already scientists are putting the Linac Coherent Light Source (LCLS) beam to use. The LCLS electron beam, first generated in April, is now traveling from ...

Ground Breaking New Science at SLAC

October 23, 2006

The Department of Energy's Stanford Linear Accelerator Center officially broke ground today for the Linac Coherent Light Source (LCLS), the world's first X-ray free-electron laser. Scheduled for completion in 2009, the LCLS ...

Recommended for you

Walking crystals may lead to new field of crystal robotics

February 23, 2018

Researchers have demonstrated that tiny micrometer-sized crystals—just barely visible to the human eye—can "walk" inchworm-style across the slide of a microscope. Other crystals are capable of different modes of locomotion ...

Recurrences in an isolated quantum many-body system

February 23, 2018

It is one of the most astonishing results of physics—when a complex system is left alone, it will return to its initial state with almost perfect precision. Gas particles, for example, chaotically swirling around in a container, ...

Seeing nanoscale details in mammalian cells

February 23, 2018

In 2014, W. E. Moerner, the Harry S. Mosher Professor of Chemistry at Stanford University, won the Nobel Prize in chemistry for co-developing a way of imaging shapes inside cells at very high resolution, called super-resolution ...

Hauling antiprotons around in a van

February 22, 2018

A team of researchers working on the antiProton Unstable Matter Annihilation (PUMA) project near CERN's particle laboratory, according to a report in Nature, plans to capture a billion antiprotons, put them in a shipping ...

Urban heat island effects depend on a city's layout

February 22, 2018

The arrangement of a city's streets and buildings plays a crucial role in the local urban heat island effect, which causes cities to be hotter than their surroundings, researchers have found. The new finding could provide ...


Adjust slider to filter visible comments by rank

Display comments: newest first

5 / 5 (1) Sep 18, 2009
Sorry, but I built an electrically-driven tabletop X-ray laser in 1986 that does the same thing. See my US Patent 4,723,263. I have continued this research to the current day and am building substantially larger devices currently . Further, to call the LCLS a "hard X-ray laser is a misnomer. Hard X-rays have energies in excess of 23 KeV which LCLS doesn't come near. My initial x-ray laser was operated at four lines at 0.86KeV, 4 KeV, 12 KeV and 33KeV in 1986 and produced 20mJ pulses out of a 12 inch long device. A little fact-checking next time please.
Sep 19, 2009
This comment has been removed by a moderator.
not rated yet Sep 20, 2009
There is still a much more efficient less energy
input method.

I agree hudres, more fact finding before stepping on the toes of folks like you.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.