DETAILED ANALYSIS OF THE 0+−0−0^+-0^- INVERSION DOUBLET IN D2_2NCN and HDNCN CYANAMIDE

M. Birk et al., J. Mol. Spectrosc. , 159G. Moruzzi et al. J. Mol. Spectrosc. , 190Z. Kisiel et al., J. Mol. Spectrosc. , 246Author Institution: Institute of Physics, Polish Academy of Sciences, Al. Lotnikow; 32/46, 02-668 Warszawa, Poland; Department of Physics, The Ohio State University, Columbus; OH 43210The cyanamide molecule is one of the prototype systems for the study of the large-amplitude inversion motion at the nitrogen atom and it is also a known astrophysical species. The rotational and vibration-rotation spectrum of the parent species has already been studied in considerable detail.}, 69-78 (1993). }$^,$}, 353-364 (1998).} Information on the deuterated isotopologues has, hitherto, been limited to transitions measured at frequencies of less, or much less, than 60 GHz. \vspace{0.2cm} Presently we report a detailed analysis of pure rotational and vibration-rotation transitions in the $0^+-0^-$ inversion doublets for the two deuterated species. The analysis is based on a 118-650 GHz spectrum for D$_2$NCN and HDNCN recorded at rotational resolution, and an 8-360 cm$^{-1}$ spectrum of D$_2$NCN recorded with the Bruker IFS 120HR interferometer at resolution of 0.0025 cm$^{-1}$. The two spectra were assigned and analysed with the modified version of the AABS package}, 39-56 (2007).} for {\it Assignment and Analysis of Broadband Spectra} and the more extensive data set for D$_2$NCN contains well over 2000 lines with $J\le80$ and $K_a\le15$. The measured transition frequencies were fitted to within experimental accuracy with a unified scheme for fitting the inversion doublet transitions in H$_2$NCN, NHDCN and D$_2$NCN. The spectroscopic constants and information on the inversion potential determined from the spectra of the three isotopologues are compared and discussed

McCarter superfinish grinding for silicon -- an update.

A grinding technique, referred to as the McCarter Superfinish, for grinding large size optical components is discussed and certain surface characterization information about flatness and the relative magnitude of the subsurface damage in silicon substrates is reported. The flatness measurements were obtained with a Zygo surface analyzer, and the substrate damage measurements were made by x-ray diffraction and acid etching. Results indicate excellent control of flatness and fine surface finish. X-ray measurements show that the diamond wheels with small particle sizes used in the final phases of the grinding operation renders surfaces with relatively small subsurface damage

High resolution tomography with chemical specificity

A very fast method of computerized critical absorption tomography featuring approx.10 ..mu..m spatial resolution and high chemical sensitivity is described. Synchrotron radiation is used and the method is especially suited to investigating small samples. From a preliminary experiment it is found that layers of neighboring elements only 0.2 ..mu..m thick can be distinguished at medium atomic numbers

The FOOTPRINT software tools: pesticide risk assessment and management in the EU at different spatial scales.

Original paper can be found at: http://www.ask-eu.com/default.asp?Menue=149&AnbieterID=586 [Full text of this paper is not available in the UHRA]In the EU-project FOOTPRINT three pesticide risk assessment and management tools were developed, for use at different spatial scales. The three FOOTPRINT tools share the same underlying science, based on the consistent identification of environmental characteristics driving the fate of agriculturally applied pesticides and their interpretation to parameterise state of the art modelling applications thus providing an integrated solution to pesticide risk assessment and management in the EU

Influence of the geometry of a hydrogen bond on conformational stability: a theoretical and experimental study of ethyl carbamate

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