Abstract
We have used NMR to observe the two-dimensional gas of atomic hydrogen adsorbed on a fritted glass "sponge" covered with superfluid $^{4}\mathrm{He}$. Measurements were made at a magnetic field of 7 T and at temperatures down to 0.080 K for a $^{4}\mathrm{He}$ surface and to 0.060 K for a $^{3}\mathrm{He}$-$^{4}\mathrm{He}$ substrate. The temperature dependence of the resonant frequency agrees with Anderson's multiple-residency model. On the $^{4}\mathrm{He}$ surface the adsorbed hydrogen is first detected at 0.095 K and has a frequency shift of -21.64(40) kHz with respect to the bulk adsorption line, corresponding to a zero-field wall shift of -43.0(8) kHz.
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