ABSTRACT
The laser induced fluorescence spectrum of the A (1)A(")-X (1)A(') transition of CFBr is presented, with selected bands recorded at sub-Doppler resolution, allowing the rotational constants to be fully determined. Analysis of dispersed fluorescence spectra and the pattern of (79)Br/(81)Br isotope splittings indicate that the origin must be shifted from previous assignments in the literature to 23 271.0 cm(-1). This implies that only the lowest four vibrational levels in the A state have significant quantum yields for fluorescence, with all other levels strongly predissociated. Comparison with photofragment measurements implies that the A state is metastable, with a barrier to dissociation of approximately 1000 cm(-1).
ABSTRACT
Sub-Doppler laser induced florescence spectra were recorded of a selection of bands within the A (2)Sigma(+)-X (2)Pi and B (2)Pi-X (2)Pi transitions of NCO in a supersonic molecular beam. The light source was a diode seeded optical parametric oscillator, which gave an effective resolution of 0.01 cm(-1) in the ultraviolet. Analysis of the A (2)Sigma(+)-X (2)Pi transition at high resolution allowed fitting of both the fine and hyperfine structures, and a set of rotational and hyperfine constants were obtained for 13 vibronic levels within the A (2)Sigma(+) state including levels of both (2)Sigma(+) and (2)Pi vibronic characters. Analysis of the 0(0) (0) and 1(0) (1) bands of the B (2)Pi-X (2)Pi transition, together with a band from the A (2)Sigma(+) state at the same energy, was also performed. These did not reveal any hyperfine structure although the resolution was the same as the work at lower total energy, and this observation is discussed. Refined rotational constants and perturbation parameters for the interaction between the A and B states were also obtained.
ABSTRACT
Activity is key to maintaining physical and mental health and well-being. However, as dementia affects the ability to engage in activity, care-givers can find it difficult to provide appropriate activities. The Pool Activity Level (PAL) Checklist guides the selection of appropriate, personally meaningful activities. The aim of this study was to assess the reliability and validity of the PAL Checklist when used with older people with dementia. A postal questionnaire sent to activity providers assessed content validity. Validity and reliability were measured in a sample of 60 older people with dementia. The questionnaire response rate was 83% (102/122). Most respondents felt no important items were missing. Seven of the nine activities were ranked as 'very important' or 'essential' by at least 77% of the sample, indicating very good content validity. Correlation with measures of cognition, severity of dementia and activity performance demonstrated strong concurrent validity. Inter-item correlation indicated strong construct validity. Cronbach's alpha coefficient measured internal consistency as excellent (0.95). All items achieved acceptable test-retest reliability, and the majority demonstrated acceptable inter-rater reliability. We conclude that the PAL Checklist demonstrates adequate validity and reliability when used with older people with dementia and appears a useful tool for a variety of care settings.
