Tag Archive for Morgan

Morgan Appointed Honorary Professor at Queen’s University

Foss Professor of Physics Thomas J. Morgan

Tom Morgan

Foss Professor of Physics Thomas Morgan has been appointed as honorary professor at Queen’s University in Belfast, Northern Ireland. He will hold this title for the next three years.

Morgan was recognized for this honor for his broad research contributions to the fields of atomic and molecular physics and plasma physics. He has published over 90 research papers, including many with international collaborators from Germany, France, Mexico and Japan.

Morgan will continue his research work at Wesleyan on highly excited states of diatomic molecules, and, as an honorary professor title holder, he will have access to Queen’s University’s resources for his research in the area of low temperature plasma physics. The appointment provides him an opportunity to concentrate on specific research projects in this area with collaborators at Queen’s University.

Morgan Speaks on Laser-Induced Breakdowns at Plasma Physics Conference

Tom Morgan

Tom Morgan

Tom Morgan, Foss Professor of Physics, recently attended the 43rd Institute of Physics U.K. Plasma Physics Conference in Isle of Skye, Scotland. He presented a flash verbal presentation and a poster contribution dealing with the properties of water following focused laser induced breakdown.

After a plasma (a gas of ions and free electrons) is formed in water by laser breakdown, the energy is dissipated through light emission, shockwaves and cavitation bubbles. When the breakdown is close to the surface of the water, surface waves and water ejection from the surface up to heights of 60 cm also occur.

All of these phenomena have been observed in the laboratory at Wesleyan in conjunction with Lutz Huwel, professor of physics, Matt Mei ’18, and international collaborators. Joining the effort from abroad are Professor Tomoyuki Murakami, Seikei University, Tokyo, and Professor Bill Graham, Queen’s University, N. Ireland.

New effects not seen before have been observed, particularly near the surface at the air-water interface. The air-water interface is ubiquitous with applications to biology, environmental studies, chemical analysis and medicine, but its detailed behavior under different conditions is not well understood. The research uses both state of the art computer simulation and experimentation to elucidate the evolutionary dynamics and structure of bulk water and the air-water interface.

“Since the meeting was in Scotland, the researchers though it appropriate to try a liquid other than water and results were reported on whiskey as well,” Morgan said.

Morgan Speaks at Atomic Molecular Optical Workshop in Mexico

Tom Morgan

Tom Morgan

Tom Morgan, the Foss Professor of Physics, recently attended an Atomic Molecular Optical International Workshop held in Cuernavaca, Mexico.

Morgan presented two invited talks, one on highly excited unusual electronic configurations of molecular hydrogen produced by laser excitation and another on laser interactions at the interface between water and air. These topics elicit novel dynamics and provide a different perspective on H2 and H2O behavior.

He also took the opportunity to reconnect with a Mexican colleague, Professor Carmen Cisneros, Institute of Physics, University of Mexico, organizer of the workshop, with whom Morgan has collaborated in the past.

Morgan Presents Phase Space Research at Gaseous Electronics Conference

Professor Tom Morgan, Andrew Murphy '11 and Jace Haestad '11 recently presented their research "Closed Orbits in Phase Space" in Hawaii. 

Professor Tom Morgan presented “Closed Orbits in Phase Space” in Hawaii.

Tom Morgan, Foss Professor of Physics, recently attended the 68th Gaseous Electronics Conference of the American Physical Society in Honolulu, Hawaii and presented a poster dealing with the behavior of giant atoms with an electron far from the nucleus in phase space. Andrew Murphy ’11 and Jace Haestad ’11 contributed to the study.

Phase space is a momentum-velocity space that provides a different perspective on atomic behavior. Looking at atoms from this viewpoint provides a mechanism to uncover new insight into their quantum nature.

Morgan also took the opportunity to reconnect with a Japanese colleague, Professor Tomoyuki Murakami, at Seikei University, Tokyo, whom Morgan spent the month of June visiting in Tokyo. Morgan and Murakami took the occasion to work on a paper on research undertaken collaboratively with Lutz Huwel, Professor of Physics, and Professor Bill Graham of Queen’s University, N. Ireland, on the behavior of the air-water interface after focused laser induced plasma breakdown. The air-water interface is ubiquitous with applications to biology, environmental studies, chemical analysis and medicine, but its detailed behavior is not well understood. The collaboration uses both state of the art computer simulation and experimentation to elucidate its dynamics and structure.

Morgan Models the Evolution of Plasma as a Visiting Professor in Tokyo

morgan

Tom Morgan is a visiting professor in Tokyo, Japan.

Tom Morgan, the Foss Professor of Physics, is spending the month of June as a visiting professor at Seikei University in Tokyo, Japan. He is collaborating with Professor Tomoyuki Murakami on modeling the evolution of plasma (an assembly of ions and electrons) created by injecting energy into water, “a substance with many interesting properties and applications,” Morgan explained.

The work focuses on water in both the vapor phase and as a liquid.

Morgan also is collaborating on this experimental work with Professor of Physics Lutz Huwel at Wesleyan. Huwel uses a pulse of laser light to provide the energy input to the water.

“The goal of the research is to understand the mechanisms responsible for the transport and evolution of the energy as time passes,” Morgan explained.

An additional focus is on how the laser light radiation energy that is deposited near the surface of water is dissipated into kinetic energy of ejected ballistic water droplets that have been observed in the lab to rise high above the water.

“There are many potential applications of underwater plasmas to the environmental, biotechnical and medical fields,” Morgan said.

The visit to Seikei University is partially funded by presidential initiative funds supplied by the Director of Global Initiatives. The funds support international faculty collaborations.

Morgan met Murakami several years ago through a common collaborator in Belfast, N. Ireland. The scientists share overlapping research interests and have published one paper together.

“Physics is a very global collaborative discipline,” Morgan said.

Learn more about Morgan’s research online here.

Huwel, Morgan Investigate Dynamics of Laser-Induced Sparks in Helium

Lutz Huwel, professor of physics, and Thomas Morgan, the Foss Professor of Physics, are the co-authors of an article titled “Investigating the dynamics of laser induced sparks in atmospheric helium using Rayleigh and Thomson scattering,” published in the Journal of Applied Physics, Volume 117 in January 2015.

The paper describes the use of two laser systems to prepare and study a helium plasma, and draws on an extensive international collaboration. The electron density and temperature of the plasma are measure as a function of time and space with high precision. The work has important impact in the area of laser induced breakdown spectroscopy and to the spectral line shape scientific community.

Morgan Published in The Physical Review A

Tom Morgan, professor of physics; John Wright Ph.D ’06; Jack DiSciacca ’07 and Jonathan Lambert (who attended Wesleyan 2002-2010) are the co-authors of an article published in The Physical Review A, June 2010.

The publication focuses on the first observation of the semi-classical scattering dynamics of a Rydberg electron with its molecular core. The system is molecular hydrogen veiled in a strong electric field.