We have obtained high resolution, partially rotationally resolved, jet-cooled cavity ringdown spectra of the origin band of the A<--X electronic transition of two of the five conformers (G(1)G(2) and G(1)T(2)) of the normal propyl peroxy radical, C(3)H(7)O(2), as well as the G conformer of the iso-propyl peroxy radical isomer. This transition, located in the near infrared, was studied using a n...

Mass-resolved excitation spectra of the C1 – X0 band of XeAr were measured under jet-cooled conditions using a tunable coherent vacuum ultraviolet ~VUV! light (l;130 nm) as an excitation light source and a high-resolution (m/Dm;1100) reflectron time-of-flight mass spectrometer. The rotational structure of the C1 – X0 (v8,0) (v852 – 6) vibronic bands were recorded by monitoring the parent XeAr i...

Inelastic excitation of Er by a U beam, studied at near-barrier energies, has led to the observation of unusual features in rotational bands built on low-lying vibrations. The population of the high-spin members of the K50, b-vibrational band is enhanced due to mixing with the K52, g-vibrational band at spin 4. Strong mixing of the K50 band with a rotationally aligned 2 qp band results in this ...

We report the first experimental observation of homonuclear propensity in collisional relaxation of a polyatomic molecule. A pump-probe stimulated Raman setup is used to pump population to a single rotational level of the v(2) = 1 vibrationally excited state in (13)C(12)CD(2) and then monitor the redistribution of the rotational population that has taken place after a fixed delay. The Q-branch ...

Quantum mechanical calculations of photofragment angular distributions have been performed as a function of the frequency of excitation, the lifetime of the dissociative state, the rotational level, and the rotational constant. In the limit of high J values and white, incoherent excitation, the general results are found to agree exactly with both those of Mukamel and Jortner [J. Chem. Phys. 61,...

A construction is described of a cartesian closed category . with exactly two elements out of a C-monoid that 9.can be recovered from A without reference to the construction. Note: The first author was partially supported by the Dutch government through the SPIN project PRISMA; the second author was partially supported by the EEC through Esprit project 415. We answer a question of Lambek and Sc...

Long carrier lifetime is what makes hybrid organic-inorganic perovskites high-performance photovoltaic materials. Several microscopic mechanisms behind the unusually long carrier lifetime have been proposed, such as formation of large polarons, Rashba effect, ferroelectric domains, and photon recycling. Here, we show that the screening of band-edge charge carriers by rotation of organic cation ...

Metamaterials have recently enabled coupling induced transparency due to interference effects in coupled subwavelength resonators. In this work, we present a three dimensional (3-D) metamaterial design with six-fold rotational symmetry that shows electromagnetically induced transparency with a strong polarization dependence to the incident electromagnetic wave due to the ultra-sharp resonance l...

via Infrared Action Spectroscopy Ilana B. Pollack, Ian M. Konen, Eunice X.J. Li, and Marsha I. Lester Department of Chemistry, University of Pennsylvania Philadelphia, PA 19104-6323 Abstract The trans-perp (tp) conformer of peroxynitrous acid (HOONO), a secondary product of the OH + NO2 reaction and a less stable isomer of nitric acid, has been identified by infrared action spectroscopy in the ...

Rotationally-resolved spectra of the m16 band of 1,3,5-trioxane, centered near 1177 cm 1, have been obtained via cavity ringdown spectroscopy using a continuous-wave external-cavity quantum cascade laser and a slit expansion nozzle. 219 transitions were identified and fitted to determine the excited state rotational constants for this band. In addition to fundamental interest, these data could ...