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The Third Spectrum of Praseodymium (Pr iii) in the Vacuum Ultraviolet.

ABSTRACT: Measurements of the spectrum of doubly ionized praseodymium from 821 to 2103 Å are given. One hundred fifty-three energy levels deduced from these wavelengths and an earlier line-list of longer wavelengths are presented. These levels are identified with the configurations 4f26s, 4f27s, 4f28s, 4f26p, 4f26d, 4f25f, 5d24f, and 4f5d6s and are given term designations. Radial energy integrals belonging to these configurations are parametrically deduced from the known levels. A value of 21.625 eV (174420 cm-1) for the ionization energy of Pr iii, with an estimated uncertainty of 0.016 eV (130 cm-1), is derived from the 4f2ns series (n = 6, 7, 8).

SUBMITTER: Sugar J

PROVIDER: S-EPMC6728461 | biostudies-literature | 1969 May-Jun

REPOSITORIES: biostudies-literature

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The Third Spectrum of Praseodymium (Pr iii) in the Vacuum Ultraviolet.

Sugar Jack J

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry 19690501 3

Measurements of the spectrum of doubly ionized praseodymium from 821 to 2103 Å are given. One hundred fifty-three energy levels deduced from these wavelengths and an earlier line-list of longer wavelengths are presented. These levels are identified with the configurations 4f26s, 4f27s, 4f28s, 4f26p, 4f26d, 4f25f, 5d24f, and 4f5d6s and are given term designations. Radial energy integrals belonging to these configurations ...[more]

PMID: 31929635

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Project description:BACKGROUND:This study is to elucidate the disinfection effect of ozone producing low-pressure Hg vapor lamps against human pathogens. Ozone producing low-pressure Hg vapor lamps emit mainly 254?nm ultraviolet light C (UVC) with about 10% power of Vacuum-ultraviolet (VUV) light at 185?nm. The combination of UVC and VUV can inactivate airborne pathogens by disrupting the genetic materials or generation of reactive oxygen species, respectively. In this study, inactivation of common bacteria including Escherichia coli ATCC25922 (E. coli), Extended Spectrum Beta-Lactamase-producing E. coli (ESBL), Methicillin-resistant Staphylococcus aureus (MRSA) and Mycobacterium tuberculosis (MTB), and that of influenza A viruses H1N1 and H3N2 under the radiation from ozone producing low-pressure Hg vapor lamps was examined. Log reduction values at different treatment durations were determined. METHODS:In vitro tests were carried out. Various bacterium and virus suspensions were added onto nitrocellulose filter papers and subjected to the illumination from ozone producing low-pressure Hg vapor lamps. The extents of pathogen inactivation at different illumination times were investigated by conducting a series of experiments with increasing duration of illumination. log10 reduction in CFU/ml and reduction at log10(TCID50) were respectively measured for bacteria and viruses. The disinfection effectiveness of this type of lamps against the pathogens under the environment with a moderate barrier to light was therefore evaluated. RESULTS:Ozone producing low-pressure Hg vapor lamp successfully inactivated these human pathogens. Nevertheless, among these pathogens, disinfection of MTB required more intense treatment. In the best tested situation, 3-log10 inactivation of pathogens can be achieved with ?10?min of VUV treatment except MTB which needed about 20?min. This demonstrated the high resistance against UV disinfection of MTB. CONCLUSIONS:Following the criteria that valid germicidal results can be reflected with 3-log10 inactivation for bacteria, 4-log10 inactivation for viruses and 5-log10 inactivation for MTB, most of the bacteria required ?10?min of VUV treatment, 20?min for the influenza viruses while MTB needed about 30?min VUV treatment. This indicated that VUV light is an effective approach against different environmental microorganisms.

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The Third Spectrum of Praseodymium (Pr iii) in the Vacuum Ultraviolet.

Publications

The Third Spectrum of Praseodymium (Pr iii) in the Vacuum Ultraviolet.

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