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We report the first direct measurement of isotope shifts of the barium 6s$^2$$^1$S$_0$ - 5d6p $^3$D$_1$ 413nm electric quadrupole transition, which isutilized for efficient barium ion trapping via photoionization using a singlecoherent light source. The measured isotope shifts relative to $^{138}$Ba are$392.6\pm0.5$ MHz, $177.9\pm0.4$ MHz, $399.7\pm0.8$ MHz, and $126.5\pm1.2$ MHzfor isotopes with atomic number 137, 136, 135 and 134, respectively. Weverified the measured isotopes with King plot analysis and compared the resultwith the formerly known shifts inferred from previous studies on neighboringtransitions. The results could be used for efficient isotope selective loadingof low-abundant barium ions, while careful suppression of line broadening isrequired for successful isotopic selectivity.

Isotope shift measurement of barium 6s$^2$ $^1$S$_0$-5d6p $^3$D$_1$ transitions for efficient isotope-selective photoionization