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Table 1

Two-step excitation schemes in Zr II.

Upper Levela Energy a [cm−1] Intermediate Levelb Energyb [cm−1 ] Excair [nm] Scheme c Detectionair d [nm] Lifetimeexp [ns] Lifetimecalc [ns]
6s e4F3/2 59610 z4F3/2 29777 335.11 2ω 316 2.90 ± 0.2 3.15
6s e4F5/2 59862 z4 F5/2 30551 341.19 2ω 323 3.17 ± 0.2 3.18
6s e4F7/2 60389 z4 F5/2 30551 335.05 2ω 317 3.16 ± 0.2 3.17
6s e4F9/2 61065 z4 F9/2 31866 342.38 2ω 342e 3.16 ± 0.2 3.15
6s e2F5/2 60903 z2 D5/2 31160 336.12 2ω 318, 378 3.05 ± 0.2 3.33
6s e2F7/2 61835 z4 F9/2 31866 333.59 2ω 375 3.11 ± 0.2 3.34
5d e4H9/2 63980 z4 G9/2 29840 292.83 2ω+AS 285 2.11 ± 0.1 2.28
5de4H11/2 64498 z4 G9/2 29840 288.44 2ω+AS 288, 306 2.15 ± 0.1 2.33
5d e4H13/2 65226 z4 G11/2 30796 290.35 2ω+AS 290f 2.07 ± 0.1 2.30
5d e4G9/2 64369 z4 G9/2 29840 289.52 2ω+AS 282, 302 2.06 ± 0.1 2.23
5de4G11/2 64903 z4 G11/2 30796 293.11 2ω+AS 285, 303 2.00 ± 0.1 2.27
5d f2F7/2 64389 z2 F7/2 30561 295.53 2ω+AS 287, 296, 301, 307 2.22 ± 0.1 2.47
5d e2G9/2 66433 z4 G11/2 30796 280.52 2ω+AS 279, 320 2.25 ± 0.1 2.43
670017/2 67001 z4 G9/2 29840 269.02 2ω+2S 280 2.46 ± 0.1
752603/2 75260 z4 F5/2 30551 223.60 3ω 236, (238), 247, 254,295 1.43 ± 0.07
751915/2 75191 z4 F5/2 30551 223.94 3ω 261, 278 0.97 ± 0.06
753445/2 75344 z4 F5/2 30551 261.89 3ω 262(pump), 266, 276,280 1.32 ± 0.08
757737/2 75773 z4 F7/2 31249 224.53 3ω 233,261, 263 1.72 ± 0.08
760097/2 76009 z4 F7/2 31249 223.34 3ω 261 1.20 ± 0.06

Notes. LS notations have been assigned to the levels where possible. The remaining levels have been given in terms of their corresponding energy and J quantum number (see the theoretical discussion in section 3).

(a) All identified levels belong to 4d2(3F)nl.

(b)All intermediate levels belong to 4d2(3F)5p.

(c)2(3)ω is the second(third) harmonic of the laser wavelength, S(AS) imply the added Stoke(anti-Stoke) shift in a high-pressure hydrogen cell.

(d)Most fluorescence measurements were preformed in the second spectral order of the monochromator.

(e)Corrected for scattered light from the second step laser and detection tuned short to avoid cascade.

(f)Corrected for scattered light from the second step laser at 290 nm.

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