The method of threshold-photodetachment spectroscopy has been used to measure the electron aSnity of Li. Changes in the partial cross sections for the resolved hv+Li (2'S)~Li(2 S)+e (ep) ( Sap) and h v+Li (2 'S)~Li(2 P)+e (es) ( Pcs) channels were separately investigated in the vicinity of the 2 P threshold. The near-threshold data in the Pcs channel were fitted to a Wigner law to determine a threshold photon energy of 19884.8+1.6 cm '. An electron affinity of 4980.9+1.6 cm (617.6+0.2 meV) is obtained upon subtraction of the well-known 2 P excitation energy. The position of the Wigner cusp in the Sap channel was measured to be 19882.4+4.0 cm ', in agreement with the more precise Pcs-channel threshold energy. PACS number(s): 32.80.Fb, 35.10.Hn 610 596248 608 615

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quarters, (20.6% vs 13.3% (Q1) vs 11.7% (Q3) vs 14.5% (Q4), p<0.001), ARDS, and IMV were also more common in late season (Table). In adjusted analyses, women with late-season influenza had 2.16-fold higher odds of ARDS (95%CI 1.43,3.28) and 2.79-fold higher odds of IMV (95% CI 1.43,5.46). CONCLUSIONS: Influenza infection between April-June, i.e. late-season influenza, is associated with increased odds of severe maternal morbidity, ARDS, and IMV. Further research into the etiology of this phenomenon is needed.

The lifefimes of the (2p)2 P 3/2 level in Si XII and the (2p 2)3 P 2,1,0, (2s2p)1 P 1 and the (2p 2)1 D 2 levels in Si XI have been determined using the beam-foil method. It is proposed that existing discrepancies between experimental and theoretical f values for the (2s 2)1 S 0-(2s2p)1 P 1 transition in some ions of the Be sequence may be the result of the inability of the experimentalist to account for strong cascading from the (2p 2)1 S 0 level.