Ratiometric comparison of intense field ionization of atoms and diatomic molecules.

Intense-laser ionization rates for rare gas atoms and diatomic molecules have been precisely compared by making simultaneous measurements of ionization yield vs laser intensity for mixed atomic and molecular targets. At a given laser intensity, the N (2) and F (2) ionization yields are slightly greater than that of Ar. Conversely, comparison of O (2) and S (2) with Xe indicates significant ionization suppression in these molecules. Recent molecular ionization models that successfully describe ionization suppression in O (2) and its absence in N (2) fail to explain our observations in F (2) and S (2).

Defining dimensions of pregnancy intendedness.

BACKGROUND: The classification scheme used by the National Survey of Family Growth (NSFG) is a well-established system for defining the intendedness of pregnancy, but its clinical relevance is uncertain. The purpose of this study was to explore how women conceptualize the intention status of their pregnancies and how their concepts relate to the classification scheme used by the NSFG. METHODS: This qualitative study used in-depth, semistructured, open-ended interviews with 27 pregnant women seeking prenatal care or abortion. Sampling was based on ethnicity (Caucasian or Hispanic), education, religiosity, and NSFG intention status (intended, mistimed, or unwanted). RESULTS: Five qualitative dimensions of pregnancy intendedness emerged: preconception desire for pregnancy, steps taken to prepare for pregnancy, fertility behavior and expectations, postconception desire for pregnancy, and adaptation to pregnancy and baby. The relationship of these qualitative dimensions to the NSFG categories was varied and complex, particularly for the NSFG mistimed category. Women indicated that their partners had a strong influence on preconception and postconception desire for pregnancy. CONCLUSION: Further research is needed to develop measures of pregnancy intendedness that accurately reflect the needs and priorities of women. Research that addresses male perspectives and influence is of particular importance.

Exploring the concepts of intended, planned, and wanted pregnancy.

BACKGROUND: A variety of terms have been used to define the intention status of pregnancies. The purpose of this study was to explore how women relate to these terms and how they define the intention status of their pregnancies. Improved understanding of how women use these terms may enhance communication between physicians, patients, and families. METHODS: This qualitative study used in-depth semistructured interviews to explore how women defined the intention status of current, past, and hypothetical pregnancies. Eighteen women who were seeking prenatal care, elective abortion, or pregnancy testing were interviewed. Most of the subjects were interviewed in the first trimester of a current pregnancy. Four researchers independently reviewed the interview transcripts and summarized the points made by each subject. RESULTS: Three major themes emerged from the interviews: (1) definitions of terms related to pregnancy varied substantially among women and seemed to be highly correlated to social and cultural influences; (2) the concepts of wanted and unwanted pregnancy were qualitatively distinct from the concepts of planned and unplanned pregnancies and seemed to be more relevant to the decision to continue or abort the pregnancy; and (3) attitudes of the male partners toward the pregnancies were very influential in how women defined their pregnancies. CONCLUSIONS: Physicians should explore the attitudes and circumstances of pregnant women, rather than focusing on whether the pregnancy was planned. Support from the significant other and the woman's underlying values about parenthood seem to be of particular importance. Our results also suggest that further studies are needed to determine the best method for measuring the intention status of pregnancy for research and policy.

PIP: This qualitative study using in-depth semistructured interviews determined how women define the intention status of current, past, and hypothetical pregnancies. The study population included 18 women, primarily in their first trimester, seeking prenatal care, elective abortion, or pregnancy testing. Findings demonstrated three major themes emerging from the interviews: 1) definition of terms related to pregnancy varied substantially among women and seemed to be highly correlated to social and cultural influences; 2) the concepts of wanted and unwanted pregnancy were qualitatively distinct from the concepts of planned and unplanned pregnancy and seemed to be more relevant to the decision to continue or abort the pregnancy; and 3) attitudes of male partners toward the pregnancies were very influential in how women defined their pregnancies.

Attention capture by novel stimuli.

In several experiments, observers were given glimpses of 4-word arrays. Accuracy of word localization was tested after each array. Some words, called familiar, appeared many times across the series of arrays; others, called novel, appeared only once. The ratio of novel to familiar words in an array ranged from 0:4 to 4:0. When familiar and novel words were not intermixed (in 0:4 and 4:0 arrays), localization accuracy was higher for familiar words. However, when they were intermixed, especially in 1:3 arrays, accuracy tended to be higher for the novel words. This novel popout effect was the outcome of the suppressed localizability of the familiar words (relative to the 0:4 baseline) and the enhanced localizability of the novel words (relative to the 4:0 baseline). Novel popout may reflect an automatic orientation of attention away from more fluently unfolding regions of the perceptual field (familiar objects) and toward less fluently unfolding regions (novel objects).