Temperature dependences of N2-broadening and shift coefficients in the ν6 perpendicular band of 12CH3D

International audienc

Temperature dependences of self- and N2-broadened line-shape parameters in the ν3 and ν5 bands of 12CH3D: Measurements and calculations

International audienc

Theoretical and revisited experimentally retrieved He-broadened line parameters of carbon monoxide in the fundamental band

International audienceWe report revisited experimentally retrieved and theoretically calculated He-broadened Lorentz half-width coefficients and He- pressure-shift coefficients of 45 carbon monoxide transitions in the 1<--0 band. The spectra analyzed in this study were recorded over a range of temperatures between 79 and 296 K. The He-broadened line parameters and their temperature dependences were retrieved using a multispectrum nonlinear least squares analysis program. The line shape models used in this study include Voigt, speed dependent Voigt, Rautian (to take into account confinement narrowing) and Rautian with speed dependence, all with an asymmetric component added to account for weak line mixing effects. We were unable to retrieve the temperature dependence of line mixing coefficients. A classical method was used to determine the He-narrowing parameters while quantum dynamical calculations were performed to determine He-broadening and He-pressure shifts coefficients at different temperatures. The line mixing coefficients were also derived from the exponential power gap law and the energy corrected sudden approximation. The current measurements and theoretical results are compared with other published results, where appropriate

Line Positions and Intensities of ¹³C¹²CH₆ in the 12.2 µm Region

<p>High-resolution, high signal-to-noise spectra of mono-substituted ¹³C-ethane (¹³C¹²CH₆) in the 12.2 <em>µ</em>m region have been recorded with a Bruker IFS 125HR Fourier transform spectrometer. Four of these spectra were recorded at three different temperatures between 130 and 208 K using a 99% ¹³C-enriched ethane sample contained in a 20.38-cm long coolable absorption cell¹. A multispectrum nonlinear least squares fitting technique²was used to fit the same intervals in these four spectra simultaneously to determine line positions and intensities. Similar to our previous analyses of ¹²C₂H₆spectra in this same region³, constraints were applied to accurately fit each pair of doublet components arising from torsional Coriolis interaction of the excited <em>ν</em>₁₂= 1 state with the nearby torsional <em>ν</em>₆= 3 state. Line intensities are reported for 1660 <em>ν</em>₁₂absorption lines for which the assignments are known, and integrated intensities are estimated as the summation of the measured values. The measured line positions and intensities are compared with values in recent editions of spectroscopic databases.⁴</p

Curricula for economic and social gain

Discusses ways of forming curriculum to promote employability and citizenship, without compromising academic values. Economic success is an aim of governments around the world. Their ‘human capital’ stance towards higher education implies the need to develop graduates’ capabilities to the full. The concept of graduate ‘employability’, currently being developed in the light of theory and empirical data, is beginning to find acceptance in the UK. One of the keys to its acceptability in higher education has been the alignment of employability with good learning – that is, learning that is manifested in complex outcomes. However, the achievement of complex outcomes requires a programme-level focus, rather than a focus on individual study units. This article reports on the way such a programme-level approach was adopted in four different universities in the UK, and how relatively small-scale actions have the potential to augment students’ employability. The implications for policy at the levels of the system, the higher education institution and the academic department are discussed