Table 7 Optimum values of laser intensity, ionization efficiency of 168Er and the degree of enrichment calculated under Doppler free condition for the various bandwidths of excitation lasers.

From: Laser isotope enrichment of 168Er

Laser bandwidth (MHz)

Laser-1 Intensity (W/cm2)

Laser-2 Intensity (W/cm2)

Laser-3 Intensity (W/cm2)

Ionization efficiency of 168Er

Degree of enrichment (%)

162Er

164Er

166Er

167Er

168Er

170Er

250

1000

1200

900

0.25

0.00

0.00

3.6

0.19

95.0

1.2

500

800

1200

2300

0.21

0.00

0.01

3.5

0.13

95.0

1.3

750

400

800

2200

0.10

0.00

0.01

3.5

0.10

95.0

1.4

1000

200

400

2000

0.02

0.00

0.02

7.1

0.11

90.0

2.8

  1. The calculations assume equal bandwidths for all excitation lasers.