Gas phase electronic spectrum of T-shaped AIC₂ radical

Gas phase electronic transitions for the C̃  B22←X̃  A21 and D̃  B21←X̃  A21 band systems of T-shaped AlC2 (C2v) radical have been measured in the 345–475 nm range. Vibrational analyses of both band systems are reported. Simulation of several rotationally resolved bands confirms previously obtained rotational parameters for the C̃  B22 state. The radical is produced by ablating an aluminum rod in the presence of acetylene gas. The resulting supersonic molecular beam is probed using both mass-selective resonant two-color two-photon ionization and laser induced fluorescence. Ab initio calculations and vertical electronic excitation energies help the assignment. Vibrational frequencies for the X̃  A21, C̃  B22, and D̃  B21 states have been determined. Rotational analysis of a number of bands yields spectroscopic constants for one vibronic state in the C̃  B22 manifold and the origin band of the D̃  B21←X̃  A21 system

Electronic spectra of C6H+ and C6H3+ in the gas phase

Measurement of the Π3−Π3 transition of C6H+ in the gas phase near 19486 cm−1 is reported. The experiment was carried out with a supersonic slit-jet expansion discharge using cavity ringdown absorption spectroscopy. Partly resolved P lines and observation of band heads permitted a rotational contour fit. Spectroscopic constants in the ground and excited-state were determined. The density of ions being sampled is merely 2 × 108 cm−3. Broadening of the spectral lines indicates the excited-state lifetime to be ≈100 ps. The electronic transition of HC6H2+ at 26402 cm−1 assumed to be A11−X 1A1 in C2v symmetry could not be rotationally resolved

Calculation of the vibrationally resolved electronic absorption spectrum of the propargyl radical (H2CCCH)

Eisfeld W. Calculation of the vibrationally resolved electronic absorption spectrum of the propargyl radical (H2CCCH). JOURNAL OF PHYSICAL CHEMISTRY A. 2006;110(11):3903-3910

Speaking out loud: Muslim women, Indian Delights and culinary practices in eThekwini/Durban

I asked, 'Did your mother teach you to cook?' Almost an hour later, time consumed by mutual reminiscences of Indian Delights, stories of the tastes and textures and colours of food and life in Durban, at last when I thought it would never be answered my question swam back up to the surface of our conversation: 'You know, then I lived with my oldest sister, not my mother. Her mother-in-law taught me.' Too heavy a shift of register, the answer dropped into the bubble of conversation we had made around ourselves, imposing another reluctant silence. I could not ask more, not then. Deliverance came through other stories. We talked about the subtly different combinations of spices that women even from the same family choose to use, and the embodied pleasures of walking into a kitchen steamed up with the smells of several dishes all cooking at once. And for the moment we avoided returning to a family narrative of separation, loss and melancholy