The X-ray spectrum associated with K-stopping in liquid hydrogen was measured with high resolution Si(Li) detectors. The total K X-ray yield is not larger than 8 x 10 4 per stopped K assuming no line broadening. A weak line pattern was found, which was tentatively ascribed to the K-H K-series X-rays. The shift and width of the ls level, deduced from this pattern, are c, s = + 270 + 80 eV and F = 560-+ 260 eV, respectively.

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