Just to add a little to Chris's suggestion.
This is how you can move the red channel.
Open your Channels Panel. Go to Window > Channels.
Select the Move Tool.
Hit cmd/cntrl + A to select all. (Select > All)
Click on the Red channel in the channels panel.
Use your directional arrow keys and move the channel to the right.
You can click back and forth between the red channel and the RGB channel to view your progress. (depends on your preference settings for viewing channels)
When done moving, click on the RGB channel.
Hit cmd/cntrl + D to deselect.
Go back to your layers panel.
You will have a slight anomaly at the edge of the image. You can crop this out now or later with the Crop Tool.
Go to Image > Canvas Size.....
Double the width.
Duplicate the image. Flip. And position.
You may have to clean up some in the center.