Polarizability anisotropies, magnetizability anisotropies and molecular quadrupole moments of acetylene, methylacetylene and dimethylacetylene

Comment on “Determination of Molecular Quadrupole Moment of Boron Trichloride by Microwave Spectroscopy” [Physica Scripta 67, 525 (2003)]

“…c Temperature dependence of Buckingham effect (¼ electric field-gradient induced birefringence) and Rayleigh depolarization ratio of CO 2 [14] and C 6 H 6 [15]. d Temperature dependence of Cotton-Mouton effect (¼ magnetic field induced birefringence), Rayleigh depolarization ratio and rotational g value of C 2 H 2 [16]. e Ab initio molecular orbital calculation for BCl 3 [2], uncertainty conservatively taken as AE10%.…”

Molecular electric quadrupole moments calculated with matrix dressed SDCI

“…Hence, it is very common to perform measurements at a single temperature and to obtain therefore the MEQM by neglecting the www.elsevier.com/locate/cplett contribution of the second effect, which is of higher order and can be assumed to be less important. In the few cases when theoretical estimations of this hyperpolarizability term are available, they are used to get the experimental MEQM [3,4].…”

Intrinsic Calibration of Molecular Alignment Using Rotational Echoes

“…From all of the above, in order to extract the alignment factor from the experimental data, one must accurately know the experimental parameters: 𝑁, 𝐿 and Δ𝛼. While Δ𝛼 can be found in spectroscopy databases (such as https://cccbdb.nist.gov/), may be calculated [26] or measured by other means [27,28], the variability in the reported values often exceed to 10-20% [29]. The experimental parameters 𝑁, 𝐿 often remain highly elusive depending on the exact experimental configuration .…”