Unravelling overlaps and torsion-facilitated coupling using two-dimensional laser-induced fluorescence

Two-dimensional laser-induced fluorescence (2D-LIF) spectroscopy is employed to identify contributions to fluorescence excitation spectra that arise from both overlapping bands and coupling between zero-order states (ZOSs). Evidence is found for the role of torsional motion in facilitating the coupling between vibrations that particularly involves the lowest-wavenumber out-of-plane vibrational modes. The experiments are carried out on jet-cooled p-fluorotoluene, where the molecules are initially in the lowest two torsional levels. Here we concentrate on the 390–420 cm−1 features in the S1 ← S0 excitation spectrum, assigning the features seen in the 2D-LIF spectrum, aided by separate dispersed fluorescence spectra. The 2D-LIF spectra allow the overlapping contributions to be cleanly separated, including some that arise from vibrational-torsional coupling. Various coupling routes open up because of the different symmetries of the lowest two torsional modes; these combine with the vibrational symmetry to provide new symmetry-allowed vibration-torsion (‘vibtor’) interactions, and the role of the excited m = 1 torsional level is found to be significant

Generating ring currents, solitons, and svortices by stirring a Bose-Einstein condensate in a toroidal trap

We propose a simple stirring experiment to generate quantized ring currents and solitary excitations in Bose-Einstein condensates in a toroidal trap geometry. Simulations of the 3D Gross-Pitaevskii equation show that pure ring current states can be generated efficiently by adiabatic manipulation of the condensate, which can be realized on experimental time scales. This is illustrated by simulated generation of a ring current with winding number two. While solitons can be generated in quasi-1D tori, we show the even more robust generation of hybrid, solitonic vortices (svortices) in a regime of wider confinement. Svortices are vortices confined to essentially one-dimensional dynamics, which obey a similar phase-offset--velocity relationship as solitons. Marking the transition between solitons and vortices, svortices are a distinct class of symmetry-breaking stationary and uniformly rotating excited solutions of the 2D and 3D Gross-Pitaevskii equation in a toroidal trapping potential. Svortices should be observable in dilute-gas experiments.Comment: 8 pages, 4 figures; accepted for publication in J. Phys. B (Letters

Highly selective CO2 vs. N2 adsorption in the cavity of a molecular coordination cage

Two M8L12 cubic coordination cages, as desolvated crystalline powders, preferentially adsorb CO2 over N2 with ideal selectivity CO2/N2 constants of 49 and 30 at 298 K. A binding site for CO2 is suggested by crystallographic location of CS2 within the cage cavity at an electropositive hydrogen-bond donor site, potentially explaining the high CO2/N2 selectivity compared to other materials with this level of porosity

Shifts in Attack Behavior of an Important Kelp Forest Predator Within Marine Reserves

Marine reserves have become increasingly valuable tools with which to manage ecosystems. These reserves consistently restore populations of top predators, often reducing availability of their favored prey. We hypothesized that such prey reduction in reserves causes protected predators to alter their attack behavior to include less palatable prey, potentially amplifying top-down effects on community structure. To test this hypothesis, we presented the relatively unpalatable sea hare Aplysia californica to freely foraging spiny lobsters Panulirus interruptus in 4 marine no-take reserves, each paired with an adjacent fished area. We found that lobsters only attacked sea hares inside reserves, where lobster density was significantly greater than that of the adjacent fished areas. Attacks on otherwise unpalatable prey exclusively in no-take reserves was likely caused by increased hunger, since in the laboratory only food-deprived lobsters attacked sea hares. These findings are the first to suggest that management involving no-take reserves may have unintended consequences on community structure that result from behavioral changes in key predators in the face of increased competition for food. We suspect that these effects may become more widely detected as reserves across the globe grow older and are researched further

Ursinus College Alumni Journal, July 1958

Dr. Helfferich succeeds Dr. McClure as President of Ursinus College • Bachelor\u27s degrees awarded to 154 • Robert G. Dunlop addresses seniors at graduation • Three faculty additions announced for Fall • Meistersingers tour N. E. • Ursinus Summer School • The Dean looks at 1958 • The Ursinus Evening School meets 1958 • Note from the Admissions Office • Six million books for Ursinus • Outstanding season for forum programs • Library bequests • St. Andrew\u27s Society award • 48% active membership in Alumni Association • Class of 1958 picks permanent officers • Alumni election results • Regional group meetings • Ursinus Woman\u27s Club program • Alumni Day 1958 • Special report: American higher education 1958 • News about ourselves • Weddings • Births • Necrology • Ursinus completes Spring sports seasonhttps://digitalcommons.ursinus.edu/alumnijournal/1062/thumbnail.jp

Ursinus College Alumni Journal, March 1957

The Corporate alumnus program grows • Companies with gift-matching programs • Progress on the dormitories continues • Pennsylvania-Reading Seashore Lines scholarships • Dr. Pfahler dies • Records that defy the tooth of time • College becomes owner of five properties • The faculty cornered • Dr. Jessie Royer Greaves, \u2792, receives award • New associate members • Associate alumni members • Meeting of Washington area alumni • New York area alumni plan spring meeting • South Jersey alumni plan buffet supper • Schuylkill Valley alumni to dine at Stokesay • Washington alumni plan spring meeting on May 24 • York alumni to meet April 27 • Lehigh Valley alumni to meet April 26 • Philadelphia alumni to meet for third year at Casa Conti • Laucks museum reopened • Senior class elects permanent class officers • Alumni-prospective student day successful • Educators rally in Philadelphia • Alumni elections • 1957 Loyalty Fund campaign increases in the number of contributors: Mid-year Loyalty Fund report • The Touchdown Twins • Football season 1956 • Soccer 1956 • Women\u27s basketball • Football banquet • Watson new court coach • Aucott, Gros, Shillingford receive all-American honors • News about ourselves • Weddings • Births • Necrology • From the Office of Admissions • Ursinus Evening School • Booster sticker boosterhttps://digitalcommons.ursinus.edu/alumnijournal/1058/thumbnail.jp

Ursinus College Alumni Journal, November 1957

Gulf Oil program to aid education • Letters to the editor • Autumn report from the Admissions Office • Early acceptance policy announced • Evening School continues growth • Messiah • The faculty cornered • Young Ursinus missionaries • Note from the Dean\u27s Office • I. C. G. Society looking for lost members • Attention classes 1944-1950 • Famous Ursinus player • G. E. corporate alumnus program extended • Old Timers\u27 Day has excellent alumni turnout • Ursinus teachers meet during Schoolmen\u27s Week • Fall meeting for Washington alumni • Alumni senior banquet • Curtain Club presents Ten Little Indians • Salmon River expedition, part of the International Geophysical Year • Four years of alumni sponsorship completed: 1957 Loyalty Fund report • Glenn Eshbach to head Loyalty Fund Committee • Alfred Gemmell scholarship fund • Contributors for the 1957 Loyalty Fund campaign • Alumnae hockey • Varsity football report • Tentative varsity and junior varsity basketball schedule, 1957-8 • Tentative varsity wrestling schedule, 1958 • Ursinus appoints new court coach • Women\u27s basketball schedule, 1958 • Coull appointed grid aid • News about ourselves • Weddings • Births • Cornelius Weygandt dies • Reunion \u2743 • Necrologyhttps://digitalcommons.ursinus.edu/alumnijournal/1060/thumbnail.jp

Interaction potentials, spectroscopy and transport properties of C+(2PJ) and C+(4PJ) with helium

We calculate accurate interatomic potentials for the interaction of a singly-charged carbon cation with a helium atom. We employ the RCCSD(T) method, and basis sets of quadruple-zeta and quintuple-zeta quality; each point is counterpoise corrected and extrapolated to the basis set limit. We consider the two lowest C+(2P) and C+(4P) electronic states of the carbon cation, and calculate the interatomic potentials for the terms that arise from these: 2-PI and 2-SIG+, and 4-PI and 4-SIG- , respectively. We additionally calculate the interatomic potentials for the respective spin-orbit levels, and examine the effect on the spectroscopic parameters. Finally, we employ each set of potentials to calculate transport coefficients, and compare these to available data. Critical comments are made in the cases where there are discrepancies between the calculated values and measured data

Ursinus College Alumni Journal, March 1960

President\u27s page • 1960 - A democratic president • Faith in the individual • Teachers are made • Alumni elections - watch for your ballot in April • On recruiting • Recent changes in the Education Department • Attention: Alumna at work • Lamond promoted • The liberal arts • An interview with Flora Rahn Lentz, Class of 1889 • Esso grant • Summer Assembly • Dr. Lentz is dead • Dr. Rice publishes new Swedish text • Dr. Stein resigns • Medical college award • Washington regional • Lehigh Valley regional • New York City regional • Philadelphia regional • South Jersey regional • Schuylkill Valley regional • Ursinus Women\u27s Club • Facts concerning the directory • Alumnae hockeyites honored • New football coach • Fall sports\u27 record • Wrestling results • Please help us • Basketball review • New look in track facilities • Track • Vanishing crafts and their craftsmen • January 1960: Mid year report of the Loyalty Fund campaign • 1960 Loyalty Fund campaign • Alvin Weiss: Man of the year • News about ourselves • Weddings • Births • Necrology • Alumni Day Saturday, June 4, 1960https://digitalcommons.ursinus.edu/alumnijournal/1068/thumbnail.jp

Ursinus College Alumni Journal, March 1959

President\u27s page • Radioactivity detection in civil defense course • From the Dean\u27s office • University of the Air • From the Office of Admissions • The library • Industrial gift trend is up • G. E. corporate alumnus program • duPont renews $4000 grant •$2000 Esso education foundation grant • Regional groups plan meetings • Philadelphia alumni install 1959 officers • South Jersey alumni plan supper party • New York alumni plan spring dinner • Washington D.C. alumni plan annual dinner • York alumni elect new officers for 1959 • Ursinus Woman\u27s Club plans spring card party • Alumni Day, Saturday, June 6 • Donald Schultz, \u2750 wilderness medic • 1901 schoolgirl driver Rhea Duryea Johnson \u2708 • International educator, scholar and editor, Jacob Foose \u2732 • January 1959 mid year report of the Loyalty Fund Campaign • Mid campaign report • Alumni elections: Watch for your ballot in April • Requests • Football 1958 • Wrestling 1959 • Alumnae hockey 1958 • Alumnae finish undefeated for second year • Proposed amended constitution • News about ourselves • Weddings • Births • Necrology • Chase Manhattan Bank employee gift matching • Saturday, June 6, 1959: Alumni festivalhttps://digitalcommons.ursinus.edu/alumnijournal/1067/thumbnail.jp