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Chris Greene

Content About: Chris Greene

Published: 02/20/2012 - 5:00pm Type of Content: Article-Research Highlight

The Greene group has just discovered some weird quantum states of ultracold fermions that are also dipoles. Dipoles are particles with small positively and negatively charged ends. Atoms (or molecules) that are fermions cannot occupy the same quantum state — unlike the neighborly bosons that readily occupy the same state and form Bose-Einstein condensates at ultracold temperatures. The...

Published: 06/13/2011 - 6:00pm Type of Content: Article-Research Highlight

There’s exciting news in the field of Efimov physics!

It’s been more than 40 years since Russian theoretical physicist Vitaly Efimov predicted a strange form of matter called the Efimov state in 1970. In these strange states, three atoms can stick together in an infinite number of new quantum states, even though any two of the atoms can’t even form a molecule. For a long time,...

Published: 06/17/2013 - 12:57pm Type of Content: News

Chris Greene has been named a College Professor of Distinction at the University of Colorado at Boulder (UCB). Greene received news of the honor on Tuesday April 19 from Todd Gleeson, Dean of UCB's College of Arts & Sciences. The title of College Progessor of Distinction is bestowed on scholars and artists of national and international renown who are also viewed by their colleagues as...

Published: 07/08/2006 - 6:00pm Type of Content: Article-Research Highlight

If you want to understand how chemical reactions happen, the ability to monitor dynamic positions of atoms in a molecule is critical. There's a well-known laser technique known as coherent Raman spectroscopy that uses a scattering laser pulse to set atoms vibrating and then measures the color shift of reflected light to detect vibration patterns. This technique has been used as a molecular...

Published: 07/08/2009 - 6:00pm Type of Content: Article-Research Highlight

The new molecules are as big as a virus. They’re ultracold. And, they’re held together by a ghostly quantum mechanical force field with the energy of about 100 billionths of an electron volt.

These strange diatomic rubidium (Rb) molecules are the world’s first long-range Rydberg molecules. They were recently formed in Tilman Pfau’s laboratory at the University of Stuttgart from an...

Published: 07/08/2009 - 6:00pm Type of Content: Article-Research Highlight

The most peculiar and fragile "molecules" ever discovered are the weakly bound triatomic Efimov molecules that form under specific conditions in a Bose-Einstein condensate (BEC). JILA theorists have now shown that such molecules can interact with an additional atom to form "daughter" molecules, which inherit many of their mother’s characteristics.

What...

Published: 04/08/2009 - 6:00pm Type of Content: Article-Research Highlight

The Greene group just figured out everything you theoretically might want to know about four fermions "crashing" into each other at low energies. Low energies in this context mean ultracold temperatures under conditions where large, floppy Feshbach molecules form. The group decided to investigate four fermions because this number makes up the smallest ultracold few-body system exhibiting...

Published: 04/08/2007 - 6:00pm Type of Content: Article-Research Highlight

Researchers from the Ye, Bohn, and Greene groups are busy exploring a cold new world crawling with polar hydroxyl radical (OH) molecules. The JILA experimentalists have already discovered how to cool OH to “lukewarm” temperatures of 30 mK. They’ve precisely measured four OH transition frequencies that will help physicists determine whether the fine structure constant has...

Published: 04/08/2007 - 6:00pm Type of Content: Article-Research Highlight

A Fermi sea forms at ultracold temperatures when fermions in a dilute gas stack up in the lowest possible energy states, with two fermions in each state, one spin up and one spin down. New analytic techniques for diving headfirst into the fundamental physics of this exotic form of matter were recently developed by graduate students Seth Rittenhouse and Javier von Stecher, Fellow Chris Greene,...

Published: 02/09/2006 - 5:00pm Type of Content: Article-Research Highlight

Imagine trying to describe the intricate motions of a single atom as it interacts with a laser. Then suppose you could generalize this understanding to a whole cloud of similar atoms and predict the temperatures your experimental physicist colleagues could achieve with laser cooling. This way-cool theoretical analysis comes compliments of Graduate Student Josh Dunn and Fellow Chris Greene....

Published: 04/08/2006 - 6:00pm Type of Content: Article-Research Highlight

One fun thing theorists do is undertake creative projects that predict phenomena that haven't yet been observed experimentally. In fact, sometimes they even predict things no one has ever imagined before. In other cases, the goal is to unravel the mechanism behind an experimental result that initially seems to conflict with the known laws of quantum physics. Fellow Chris Greene's...

Published: 02/09/2006 - 5:00pm Type of Content: Article-Research Highlight

High-energy radiation is notorious for damaging DNA, primarily by breaking chemical bonds. Damage to DNA can cause mutations, cancer, or even death. Much of this damage is inflicted by secondary, or low-energy, electrons knocked out of atoms in the DNA molecules by radiation. The low-energy electrons get captured by the DNA bases (which make up the letters of the genetic code), temporarily...

Published: 04/08/2005 - 6:00pm Type of Content: Article-Research Highlight

A high-powered JILA collaboration led by JILA Fellows Jun Ye and Chris Greene is making important progress toward developing an ultrastable, high-accuracy optical atomic clock. The new optical clock design will use a variety of laser sources including a femtosecond comb and a diode laser stabilized with an optical cavity, which, in turn, is locked to a narrow energy level transition in...

Published: 05/01/2011 - 6:00pm Type of Content: Article-Research Highlight

Triatomic hydrogen ion (H3+) has many talents. In interstellar clouds, it can be blown apart by free low-energy free electrons, which interact with the ion core (H3+), briefly forming unstable H3 molecules. The interaction of the electron with the ion core almost immediately causes the molecule to fall apart into three hydrogen atoms (3H) or a hydrogen molecule (H2) and an H atom. This...

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