Wikibooks: Chemical Sciences: A Manual for CSIR-UGC National Eligibility Test for Lectureship and JRF/NMR spectra database

dewikify Nuclear Magnetic Resonance (NMR) spectra database is an [[electronic repository]] of information concerning [[NMR spectra]]. The repository can be stored as a complete self contained data set or as an online repository that can be accessed and searched remotely. The form in which the data is stored ranges from line lists that can be graphically displayed to raw [[free induction decay]] (FID) data. The data is usually annotated in a way that correlates the spectral data with the related molecular structure. = Data format = =Line list = The form in which most NMR is described in literature papers. It is common for databases to display line lists graphically in a manner that is similar to how processed spectra might appear. These line list however lack first and higher order splitting satellites from low abundance isotopes like carbon or platinum as well as the information concerning line width and other informative aspects of line shape. The advantage of a line list is that it requires a minimal amount of memory. = Processed image = Once an FID is processed into a spectrum it can be converted into an image that usually takes up less memory than the FID. This method requires more memory than a line list but supplies the user with considerably more information. The processed image has less information that a raw FID but it also take less memory and is easily displayed in browsers and requires no specially data handling software. = Raw free induction decay (FID) file = The data obtained when performing the experiment are stored according to the formatting preferences of the instrument manufacturer. This data format contains the most information and requires the most storage space. Since there are no applications for viewing FIDs in browsers the FID must be downloaded and subsequently processed. A variety of commercial and free of software programs allow users to process FID data into useful spectra once the FID file is stored on their computer. = Methods to search databases = Not all databases can be ...