UConn’s Old Planetarium Gets a New Upgrade
Connecticut’s oldest planetarium will soon be back in action. Once used for education and outreach for UConn faculty, students, and community members, the planetarium fell into disuse in the last several years, but Department of Physics Assistant Professor-in-Residence Matt Guthrie has been working hard with skilled facilities staff, including CLAS Facilities Team Leader Brett DeMarchi, to bring this piece of UConn history back into working order.
[Read More]Solar Eclipse Viewing Event: 2-4:30pm Mon Apr 8 on Horsebarn Hill
UConn faculty and students will host a community event to view the solar eclipse at 2:00-4:30pm this Monday, April 8, on Horsebarn Hill (behind the Dairy Bar). Here in Storrs we’ll observe a maximum occultation of 92% at 3:28pm. This is a very exciting and special opportunity, since the next time that our location will […]
[Read More]Two physics undergrads among 2024 University Scholars
Two of UConn Physics Department’s undergrads, Rachel Cleveland and Nicholas Thiel-Hudson, have been recently selected as part of the 2024 cohort of UConn University Scholars! These students were selected based on the strength of their proposal. Graduation as a University Scholar recognizes a student’s extraordinary engagement with self-reflective learning and research or creative endeavors.
[Read More]A Team Effort is Giving New Life to a Classic Observatory
After years of disuse, the UConn Observatory, featuring a 16-inch optical telescope, is coming back into service. Physics faculty member Matt Guthrie, a driving force behind this rejuvenation effort spoke with UConn Today about the benefits offered by the Observatory both to students and to the community.
[Read More]Physics Celebrates 51’st Annual Ascent of Mount Monadnock
On October 14, 2023 40-50 members and friends of the UConn Physics department took part in the 51’st annual ascent up Mount Monadnock, near Jaffrey, New Hampshire. After the hike, the then-hungry hikers descended to the campground near Gilson Pond and enjoyed some well-earned refreshments.
[Read More]Upcoming events
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Apr
26
PhD Dissertation Defense 10:00am
PhD Dissertation Defense
Friday, April 26th, 2024
10:00 AM - 12:00 PM
Gant South Building
Graduate student Mitchell Bredice, Department of Physics, University of Connecticut
Kinetics, Nucleation, and Relaxation Dynamics of Ion-Seeded Nanoparticles
The recent interest in studying the adsorption and emission spectra of the hazy atmospheres of exoplanets stimulates the interest in clusters, small aggregates of atoms or molecules. The nucleation and dynamics of nanoparticles in the Earth’s atmosphere and their impact on the global climate and environment is another important area of research stimulating investigations of nucleation processes. However, how these small aggregates form is not wholly understood. Traditionally, nucleation of clusters or other phases is described through Classical Nucleation Theory. Although this theory has many discrepancies in describing the nucleation of submicron particles. In this work, we have performed molecular dynamics simulations of the nucleation of ion-seeded nanoparticles, specifically ArnH+ clusters, to investigate the microscopic mechanisms of nucleation from a gas or liquid phase. From these simulations, we have studied the stages of the nonequilibrium and equilibrium growth of ArnH+ clusters and analyzed the size distribution and internal energy relaxation of nascent clusters during different stages of their growth. The fundamental impact of the internal energy relaxation on the nonequilibrium nucleation of small ArnH+ clusters has been demonstrated. This analysis has generally been avoided in previous investigations due to assumptions of the equilibrium nature of the nucleation process. The results of our simulations showed that nanoparticles are formed in highly excited states, thus the cluster growth and relaxation are concurrent processes, and that relaxation of the cluster internal energy can delay cluster growth processes. To further investigate the internal energy relaxation, an ensemble of molecular dynamics simulations was performed for the detailed analysis of the average time evolution of kinetic, potential, and total energies of small ArnH+ clusters, and their kinetic energy relaxation. The results of the performed simulations have been explained through the use of a collisional Boltzmann equation describing the energy relaxation processes. Lastly, the general relationship between nonequilibrium growth and internal energy relaxation is discussed.
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Apr
26
UConn Physics SPS Colloquium 4:00pm
UConn Physics SPS Colloquium
Friday, April 26th, 2024
04:00 PM - 05:00 PM
Gant West Building
Prof.. Reina Maruyama,Yale University
What is dark matter?
Astrophysical observations give overwhelming evidence for the existence of dark matter. Several theoretical particles have been proposed as dark matter candidates, including weakly interacting massive particles (WIMPs), axions, and, more recently, their much lighter counterparts. However, there has yet to be a definitive detection of dark matter. For years, one group, the DAMA collaboration, has asserted that they observe a dark matter-induced annual modulation signal in their NaI(Tl)-based detectors. Their observations are inconsistent with those from other direct detection dark matter experiments under most assumptions of dark matter. In this talk, I will describe how I came to work on this topic and the debate’s current status, the worldwide experimental effort to test this extraordinary claim, and our progress toward resolving the current stalemate in the field.
Note: The pre-colloquium reception will be 3-4pm in the Gant Light Court
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Sep
20
Prof. Mingda Li (MIT) (UConn Physics Colloquium) 3:30pm
Prof. Mingda Li (MIT) (UConn Physics Colloquium)
Friday, September 20th, 2024
03:30 PM
Gant West Building
Prof. Mingda Li, MIT
UConn Physics Colloquium
Title and Abstract: TBD