Chirped-Pulse millimetre-Wave (CPmmW) rotational spectroscopy provides a new class of information about photolysis transition state(s). Measured intensities in rotational spectra determine species-isomer-vibrational populations, provided that the rotational populations can be thermalized. The formation and detection of S(0) vinylidene is discussed in the limits of low and high initial rotationa...

The OCS photodissociation dynamics of the dominant S((1)D2) channel near 214 nm have been studied using velocity map ion imaging. We report a CO vibrational branching ratio of 0.79:0.21 for v = 0:v = 1, indicating substantially higher vibrational excitation than that observed at slightly longer wavelengths. The CO rotational distribution is bimodal for both v = 0 and v = 1, although the bimodal...

Dipolar Bosonic atoms confined in external potentials open up new avenues for quantum-state manipulation and will contribute to the design and exploration of novel functional materials. Here we investigate the ground-state and rotational properties of a rotating two-component dipolar Bose-Einstein condensate, which consists of both dipolar bosonic atoms with magnetic dipole moments aligned vert...

We demonstrate the application of molecular rotational spectroscopy to measure the conformation isomerization rate of vibrationally excited pent-1-en-4-yne (pentenyne). The rotational spectra of single quantum states of pentenyne are acquired by using a combination of IR-Fourier transform microwave double-resonance spectroscopy and high-resolution, single-photon IR spectroscopy. The quantum sta...

The laser excitation spectrum of the 327 nm band system of CoCl2, formed in a free-jet expansion, has been recorded at a rotational temperature of approximately 10 K. The spectrum is congested and suffers extensive perturbations. A progression in the excited state symmetric stretching vibration has been identified. The decrease in the symmetric stretching vibrational wave number on excitation i...

The (v′ = 34, J′ = 14) level of the A∑u electronic state of Na2 has been selectively populated by excitation with the 578.1 nm line of a ring dye-laser with rhodamine 6G. Through collisions with (S1/2) Na atoms, energy is transferred to neighbouring rotational levels in Na2, and the density of these levels is determined by observing the fluorescence to the electronic ground state. From previous...

Close-coupling calculations and experiment are combined in this work, which is aimed at establishing a set of state-to-state rate coefficients for elementary processes i j → m in O2:O2 collisions at low temperature involving the rotational states i, j, ,m of the vibrational ground state of O2( − g ). First, a set of cross sections for inelastic collisions is calculated as a function of the coll...

Articles you may be interested in Single-photon and resonance-enhanced multiphoton threshold ionization of the allyl radical Single-photon threshold photoionization spectra for jet-cooled NO have been measured for the v+ =0 and 1 vibrational levels of the X I~+ ground state of NO+. The NO+ rotational state distribution for the v+ =0 level is shown to be perturbed by nearby autoionizing levels, ...

We investigate theoretically the rotational dynamics of pyramidal XY3 molecules in highly excited rotational states. Towards this end we compute, by a variational method, the rotational energy levels in the vibrational ground state of PH3 for J < or = 80. At J > or = 50 the calculated energy levels show a distinct cluster pattern. By monitoring the cluster formation we follow the various stages...

Over 250 rotational transitions of the internal rotor methyl formate (HCOOCH3 ) in its ground ( V1 = 0) degenerate (E) torsional substate have been measured in the millimeter-wave spectral region. These data and a number of E-state lines identified by several other workers have been analyzed using an extension of the classical principal-axis method in the high barrier limit. The resulting rotat...