There are four logical parameters to consider within the confines of the diffractometer and single crystal diffraction experiment. The quadrant model for the crystal environment is a logical extension of the physical parameter space which can be applied to that environment. Non-ambient chemical crystallography exploits these four parameters either in tandem or individually and all in situ during the diffraction experiment.

NAC Quadrant

Atmosphere

There is much, much more to come on this but for now why not start try reading about:

Temperature

There is much, much more to come on this but for now why not start try reading about:

Pressure

Again more to come on this.

External Stimuli

Again more to come on this.