Data for figure 3a of PHYSICAL REVIEW LETTERS123,221802 (2019) Retarding Energy (eV)    Rate (s-1) 18535.116 20.3774   18537.092 17.1626   18539.127 14.1988   18541.093 11.6754   18543.100 9.4446   18545.099 7.5715   18547.131 5.9194   18549.099 4.6084   18551.099 3.538   18553.111 2.6031   18555.115 1.8883   18557.111 1.3572   18559.090 0.9545   18560.104 0.7975   18561.115 0.661   18562.115 0.5581   18563.120 0.4782   18564.131 0.4145   18565.110 0.3681   18567.094 0.3155   18569.119 0.2973   18571.098 0.2943   18576.108 0.2903   18581.100 0.2909   18591.107 0.2913   18601.073 0.2923   18621.097 0.2924