There is also a technique that can be used to simulate infared even if your digital camera is not infared sensitive. Try this with any image with high levels of green foliage in it.
Again a lot of post processing is required and produces a monochrome end result. 1st open your image in full RGB colour. Then add a channel mixer layer. Boost the green channel to 200% and then, to keep everything at ~100% overall, reduce the other channels to minus numbers - I tend to use ~-30% red & -70% blue, and tick the monochrome box.
Next, to get the glow that you get with IR film, we need to add some blur. Go to the channels pallate, select the green channel only and apply some gaussian blur - about 5 pixels should do it. Then to make the effect less severe, reduce with and Edit > Fade Filer command to what looks right - try 25%.
Finally, IR film is very grainy so you might want to add some gaussian noise, either to the whole image or just to the green channel.
You should end up converting something from this
Barn in Field 3088.jpgto something like this
Barn in Field (IR)3088.jpg The frames were added afterwards with photoshop actions.
Do you prefer the full colour or the mono?