Consequently, an IR spectrum affected by scattering drops more (%T display) towards the short wavelength (high wavenumber) end. This is caused by scattering of the infrared light at the sample surface or interior, and this effect is greater for the shorter wavelength.

The spectrum of a transmission measurement may drop off at the left (%T display) if the sample has a rough surface or contains inorganic compound powder. Ideally the baseline of an infrared spectrum is flat over the whole spectral width. The automatic peak picking option usually picks way to many points making your spectal image very crowded and unclear. Single peaks can be picked using the 'Peak by Peak' button from the 'Peaks' group. Now you can select different regions and height thresholds where peaks should be detected. To annotate all interesting peaks select 'Manual Threshold’ from 'Peaks' group in the ‘ELVIS Processing’ ribbon. In order to zoom in the vertial direction simply use the scroll wheel of your mouse. Besides the short-cuts, the 'Spectrum Toolbar' from the 'View' ribbon also adds the most used magnification buttons to the right hand side of the screen for easy access. The zoom functions can also be accessed via keyboard short-cuts 'Zoom In' (z), 'Zoom Out' (shift + z), 'Full Spectrum'(f). All magnification functions can be found in the 'View'ribbon While processing and interpreting your spectrum it is sometimes neccesary to zoom in to specific spectral regions or peaks. After loading the file click the 'Apply' and 'Set as Default' buttons at the bottom of the 'Properties' window followed by 'OK'.īefore interpreting the spectrum you should execute the following manipulations: Zoom in/out Right click in the spectral window and select 'Properties'ĭownload the FTIR Spectrum Properties file located here and load in into MestreNova using the 'Folder' symbol at the top of the 'Properties' Window. The first time you open a FTIR data file you have to set the display properties. FTIR data are stored as a JCAMP-DX file wich contains all datapoints and measurement parameters in a ASCII format.Ī FTIR dataset in opened by simply dragging and dropping the data file into Mnova.

Peak picking in mestrenova