2-[2-(Methyl­sulfan­yl)benzimidazol-1-yl]ethanol

In the title compound, C10H12N2OS, the asymmetric unit consists of two independent mol­ecules. In the crystal structure, mol­ecules form R 4 4(28) centrosymmetric tetra­mers via O—H⋯N hydrogen bonds. These tetra­mers are stacked along the c axis via C—H⋯O hydrogen bonds. C—H⋯π and π–π inter­actions are also present; in the latter, the centroid–centroid distances are 4.075 (1) and 3.719 (1) Å

OBSERVATION OF AN UNGERADE RYDBERG STATE OF 7Li2^{7}Li_{2}

$^{a}$Permanent address: UFR SSMT Universit\'{e} de Cocody, 22 BP 582 Abidjan 22, Ivory Coast., $^{b}$W. Theiss, H. J. M\""{u}schenborn, and W. Demtr\""{o}der, Chem. Phys. Lett. 174 (1990) $126-132 ^{c}$. R. Bernheim, L. P. Gold, and T. Tipton, J. Chem. Phys. 78 (1983) 3635-3646Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire, (UMR 5579 CNRS), B\^{a}timent A. Kastler, Universit\'{e} Lyon I, Domaine Scientifique de la DouaSome weak, collisionally induced transitions have been observed following excitation of the two lowest vibrational levels of the $5d {^{1}}\Pi_{g}$ state of $^{7}Li_{2}$ (produced in a heatpipe source). The transitions were recorded in Fourier transform resolved fluorescence spectra in the near infrared $(7900 - 8800 cm^{-1})$, at an instrumental resolution of $0.08 cm^{-1}$, and they have been assigned as transitions from a Rydberg $^{1}\Pi_{u}$ state to $v = 0, 1$ and 2 of the $1 ^{1}\Delta_{g}$ electronic state. It seems highly likely that the two upper state levels populated through the collisions are $v = 0$ and $v = 1$ of $a ^{1}\Pi_{u}$ state which lies very close in energy to the $5d {^{1}}\Pi_{g}$ state. The energy transfer occurs to $v = 0$ of the $^{1}\Pi_{u}$ state from $v = 0$ of the $5d ^{1}\Pi_{g}$ state, and (at low J only) to $v = 1$ of the $^{1}\Pi_{u}$ state from $v = 1$ of $5d ^{1}\Pi_{g}$. Six bands were analysed: $0-0, 0-1, 0-2, 1-0, 1-1$ and 1-2. The rotational constants of this $^{1}\Pi_{u}$ state are too large to be high levels of the other ungerade Rydberg state of $Li_{2}$ documented in the literature, namely the $D ^{1}\Pi_{u}$ state studied by Theiss and $co-workers^{b}$. They are however sufficiently close to those of the $5d ^{1}\Pi_{g}$ state $(T_{e} = 37257.7 cm^{-1}, B_{e} = 0.48 cm^{-1}, \omega_{e} = 237.4 cm^{-1})$ given in earlier $work^{c}$, that we suggest the Rydberg state is most likely to correlate at long range with $Li(2s) + Li(5p)$ atoms. Principal spectroscopic constants are $T_{o} = 37390.198(5) cm^{-1}, B_{o} = 0.50627(12) cm^{-1}, \Delta G_{v} = 262.4 cm^{-1}$

Application of laser induced fluorescence technique to the study of potassium deficiency of the palm oil tree [Elaeis guineensis(Jacq)

Application de la technique de fluorescence induite par laser à l'étude de la déficience du potassium chez le palmier à huile [Elaeis guineensis(Jacq)

DETERMINATION OF THE POTENTIAL ENERGY CURVE OF THE D\,^1\Pi STATE OF NaK BY TWO-COLOR POLARIZATION LABELING SPECTROSCOPY

Author Institution: Universite Lyon 1 and CNRS (LASIM, UMR 5579), 69622 Villeurbanne, France; UFR SSMT Universite de Cocody, 22 BP 582 Abidjan, Ivory Coast Republic; Institute of Physics, Polish Academy of Sciences, Al.; Lotnikov 32/46, 02-668 Warsaw, Poland; Institute of Experimental Physics, Warsaw University, ul.; Hoza 69, 00-681 Warsaw, Poland; Department of Chemistry, Moscow State University, 119992; Moscow, RussiaTwo-colour polarization labeling experiments measuring the $D\,\leftarrow\,X$ system of NaK have furnished observations of the D $^{1}\Pi$ state of NaK up to v" = 42. The last observed level is located 7 cm$^{-1}$ below the Na(3p $^2P_{3/2}$) + K(4s) atomic asymptote, clearly indicating the dissociation products of this state. The vibrational progressions all exhibit irregular intervals, predominantly because of strong interactions with the nearby d $^3\Pi$ state, which also dissociates to Na(3p) + K(4s) atoms. The polarization data have been combined with some resolved fluorescence $D\,\rightarrow\,X$ transitions, and analyzed by fitting to spectroscopic parameters and to an analytical potential curve. A full deperturbation treatment has not been attempted, but a ``robust'' weighting scheme has been used to reduce the influence of levels that cannot be properly represented by a single channel model. Parameters determined in a fit to a potential curve include $T_e$ = 20090.15 $\pm$ 0.02 cm$^{-1}$, $D_e$ = 2157.0 $\pm$ 0.3 cm$^{-1}$, $R_e$ = 4.155 $\pm$ 0.002 \AA, with an unweighted root mean square error of 0.12 cm$^{-1}$ for 959 data