TRAPPING AND SPECTROSCOPY OF HYDROGEN

I review the results and techniques used by the MIT H-up arrow group t o achieve a fractional resolution of 2 parts in 10(12) in the 1S-2S tr ansition in hydrogen [1]. With some improvements, this system should d eliver 100 times higher resolution with an improved signal count rate getting us closer to an old advertised goal of a precision of 1 part i n 10(18). While these developments are very important for the proposed test of the CPT theorem through the comparison with anti-hydrogen, so me of the techniques used with hydrogen are not applicable to anti-hyd rogen and I discuss some difficulties and alternatives for-the trappin g and spectroscopy of anti-hydrogen.