SPVIEW (SPectrum-VIEWer) allows to assign experimental high-resolution molecular spectra. The input elements are:
The data are plotted in the center of the window (data area) and the peaks and predicted lines are displayed as ticks in the upper part (pred/exp area). The peaks and/or predicted lines ticks can be associated to one of the data files so that they follow its drawing modifications (X shifts). The association is shown by a common color.
Each assignment is either of frequency or intensity type. Each type is specified by a mark which should be either a space (not assigned with this type), a '+' (to be fitted with this type) or a '-' (to be ignored in the fit with this type). Experimental ticks are topped by global frequency and intensity marks. Each global mark is either a space (if no assignment is of this type), a '+' or a '-' (if all assignments of this type have this mark) or a '?' (if assignments of this type do not have all the same mark).
A so-called EXASG string is associated to each assignment. It is used by the fit job to select the lines to be taken into account. The initial default value of this string for new assignments is 'SPVIEW_EXASG'. This default value can be modified.
The pred/exp area ticks can be selected with the mouse and in this way predicted lines can be assigned to each experimental peak (see Popup menus below). Once this is done, one can save the assignment file (Assignment menu).