Mountain Scholar
Mountain Scholar is an open access repository service that collects, preserves, and provides access to digitized library collections and other scholarly and creative works from Colorado State University and the University Press of Colorado. It also serves as a dark archive for the Open Textbook Library.
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Recent Submissions
Detection and transit time measurements of individual sodium atoms diffusing in a helium flow by the laser resonance fluorescence correlation technique
(Colorado State University. Libraries, 1979) Pan, Ci-Ling, author; She, C. Y., advisor
This thesis describes the laser resonance fluorescence correlation technique for single-atom velocity measurement. Using this technique, we have detected individual sodium atoms diffusing through a laser beam in a slow helium flow. From the width of the fluorescence bursts detected, the transit time for the diffusing atom is determined. This is the first measurement of the motion of a single atom in a buffer gas. A probability analysis was developed which allowed us to estimate the average burst size of emitted fluorescence photons by an atom traversing the laser beam. All these results were in general agreement with the theoretical predictions. With improvements, we will be able to measure the velocity of a single-atom either in a flow or in a vacuum. By averaging over many sodium atoms, the diffusion coefficients of sodium atoms in helium and argon buffer gases were investigated using this technique. The measured diffusion coefficients were found to be in reasonable agreement with theoretical predictions and previous experimental results. To our knowledge, this is the first application of resonance fluorescence correlation technique to the measurement of diffusion coefficient of fast moving atoms in gases.
A career workshop's effect on vocational identity, career indecision and self efficacy of 10th graders
(Colorado State University. Libraries, 1996) Caligiuri, Judith A., author; Daly, Joseph, advisor; Kees, Natalie, committee member; Feller, Richard, committee member; Turner, Joseph G., committee member
The purpose of this study was to determine a career workshop's effect on the vocational identity, career indecision, and career self efficacy of 10th grade high school students: Twelve research questions were tested to determine the workshop's effect on the three dependent variables: vocational identity, career indecision, and career self efficacy. The primary independent variable was the activities in the workshop. The study also examined whether gender, ethnicity, or academic ability interacted with the treatment workshop on students' vocational identity, career indecision, and career self efficacy. Three standardized instruments were used to measure the variables. The My Vocational Situation, vocational identity scale (Holland, Daiger, & Power, 1980) was used to measure vocational identity. The Career Decision Scale, career indecision scale (Osipow, Carney, Winter, Yanico, & Koschier, 1976) was to used to measure career indecision. The Occupational Self Efficacy Scale, confidence rating scale, (Betz & Hackett, 1981) was used to measure career self efficacy. The 171 subjects in this study were from two rural high schools in Colorado. Eighty seven subjects formed the treatment group sample. Eighty four students formed the control group sample. Major findings in the study indicated the treatment group increased significantly in vocational identity on the MVS post test. Career indecision was significantly lower for the treatment group, as measured by the CDS post test. Career self efficacy did not show a significant degree of change. Boys and girls in the treatment group changed significantly on post test adjusted scores in vocational identity and career indecision. Hispanics in the treatment group did not show a significant degree of change from the Hispanics in the control group on any of the dependent variables. Students of high, middle, and low academic ability did show a significant increase in vocational identity, and a decrease in career indecision. Some limitations exist. Career workshops using other assessments, other blocks of time, or alternate activities with subjects in a different demographic area may find different results. Therefore, generalizability is limited. However, indications supported the use of a career workshop intervention with high school 10th graders to increase vocational identity, and decrease career indecision. More research on the construct of self efficacy is encouraged.
Two-dimensional oxygen clusters and films adsorbed on graphite
(Colorado State University. Libraries, 1981-01) Pan, Ru-Pin Chao, author; Etters, Richard D., advisor; Sites, James R., committee member; Johnson, Gearold R., committee member; Gillis, Nelson S., committee member
The orientations, structures and phase transitions of two-dimensional oxygen molecular clusters adsorbed on the graphite plane were studied using the Monte-Carlo method. Orientational phase transitions have been found for all cluster sizes studied. Melting temperatures show agreement with measured values for extremely low coverage films. Two different approximations were used in the cluster studies. In one approximation, the interaction between a cluster and the surface was ignored and the center of mass of each oxygen molecule was fixed on a plane. In the other case an atom-atom Lennard-Jones potential was used to determine the surface interaction. An analytic expression was used for the summation over all the carbon atoms in the graphite. The minimal energies and structures of infinite adsorbed films were studied using an energy minimization method. Two stable phases have been found. The molecules in the low density phase are all oriented parallel to the substrate, while the molecules in the high density phase are perpendicular to the substrate. These two phases are identified as the experimentally measured δ and β phases, respectively. The lattice constants are found to be in agreement with the measured values within 3%.
Daily weather extremes 1889 - 2019
(Colorado State University. Libraries, 2023-12) Colorado Climate Center, author
September 2022 Colorado monthly climate summary
(Colorado State University. Libraries, 2022-09) Colorado Climate Center, author