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Table A.1

Rest frequenciesa (MHz) of para- and ortho-H2O+ ground state transitions from different sources.

Quantab ALMAc CDMS newc CDMS oldd Mürtz et al. (1998) e
para-H2O+, 110−101, J =
1.5−0.5 604 684 .10 (76) 604 682 .66 (38) 604 678 .6 (25) 604 758 .7
1.5−1.5 607 225 .79 (17) 607 225 .80 (17) 607 227 .3 (19) 607 223 .9
0.5−0.5 631 725 .08 (42) 631 724 .98 (39) 631 724 .1 (37) 631 773 .0
0.5−1.5 634 266 .44 (78) 634 268 .11 (39) 634 272 .9 (24) 634 238 .2
ortho-H2O+, 111−000, J = 1.5−0.5, F =
1.5−0.5 1 115 155 .98 (76) 1 115 150 .75 (85) 1 115 150 .3
0.5−0.5 1 115 191 .40 (72) 1 115 186 .18 (81) 1 115 186 .0
2.5−1.5 1 115 209 .33 (73) 1 115 204 .15 (82) 1 115 204 .0
1.5−1.5 1 115 268 .08 (75) 1 115 262 .90 (82) 1 115 263 .0
0.5−1.5 1 115 303 .50 (82) 1 115 298 .33 (87) 1 115 298 .7
ortho-H2O+, 111−000, J = 0.5−0.5, F =
0.5−0.5 1 139 536 .62 (96)f 1 139 541 .5 (10) 1 139 541 .1
1.5−0.5 1 139 555 .79 (84)f 1 139 560 .6 (9) 1 139 560 .6
0.5−1.5 1 139 648 .73 (85)f 1 139 653 .7 (9) 1 139 653 .5
1.5−1.5 1 139 667 .89 (91)f 1 139 672 .7 (10) 1 139 673 .3
para-H2O+, 212−101, J =
2.5−1.5 1 626 333 .5 (13) 1 626 324 .6 (23) 1 626 315 .0
1.5−0.5 1 638 944 .9 (12) 1 638 934 .8 (20) 1 638 972 .0
1.5−1.5 1 641 488 .1 (12) 1 641 483 .6 (24) 1 641 437 .2

Notes.

(a)

Numbers in parentheses after the values refer to the uncertainties in units of the least significant figures.

(b)

Final quantum numbers J′−J′′ (para) or F′−F′′ (ortho).

(c)

This work.

(e)

Estimated uncertainties are about 1.8 MHz throughout (Mürtz et al. 1998).

(f)

Tentative, see text.

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