Getting Started

See Walkthrough of Simulating and Fitting a Simple Spectrum for a detailed introduction with a provided spectrum. For working on assigning complex spectra see Automatic Fitting (not for beginners).

A basic .pgo file for each of the four molecule types implemented in PGOPHER can be created from the File menu. For a walk through of the basics of setting up a simulation for each molecule type see:

• Making a data file for a Linear Molecule See also:
• Worked Example - The Schumann-Runge Bands of O₂
• Fitting example - the A-X transition in C₃
• Multiple State Fitting example - the A-X transition in C₃
• Making a data file for a Symmetric Top
• Making a data file for an Asymmetric Top
• Making a data file for simulating vibrational structure

It is also possible to work from a completely empty file, or modify an existing .pgo file. For more details, and sample files see under the molecular type:

• Linear Molecules
• Symmetric Tops
• Asymmetric Tops
• Vibrating Molecules - This is to be used when simulating the vibronic structure only, ignoring the rotational structure.
  

PGOPHER data files (.pgo files) contain all the rotational constants and other settings required to perform a simulation. (Note that overlaid experimental spectra are held in separate files.) Modifications to the file (either modifications to individual settings and parameters, or more major changes such as addition or deletion of species, molecules, manifolds, states, perturbations or transition moments) can then be effected in the constants tree view. The data file contains a hierarchy of objects, to represent the molecules and states involved in the transition; this works rather like a nested directory structure containing files except that each level can only contain certain types of object. (The top level objects must be Species or Simulation objects for example.) Data files can also be merged to combine spectra using copy and paste operations from the constants view between two running copies of PGOPHER.