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After almost two decades of high resolution molecular spectroscopy in superfluid helium droplets, the understanding of microsolvation is still the subject of intense experimental and theoretical research. According to the published spectroscopic work including microwave, infrared, and electronic spectroscopy, the latter appears to be particularly promising to study microsolvation because of the appearance of pure molecular transitions and spectrally separated phonon wings. Instead of studying the very details of the influence of the helium environment for one particular dopant molecule as previously done for phthalocyanine, the present study compares electronic spectra of a series of non-polar porphyrin derivatives when doped into helium droplets consisting of 104–105 helium atoms. Thereby, we focus on the helium-induced fine structure, as revealed most clearly at the corresponding electronic origin. The interpretation and the assignment of particular features obtained in the fluorescence excitation spectra are based on additional investigations of dispersed emission spectra and of the saturation behavior. Besides many dopant-specific results, the experimental study provides strong evidence for a particular triple peak feature representing the characteristic signature of helium solvation for all seven related dopant species.
A moderately intense, nonresonant, linearly polarized nanosecond laser pulse is used to induce one-dimensional (1D) adiabatic alignment of 1,4 diiodobenzene (C6H4I2), iodobenzene (C6H5I), and methyliodide (CH3I) molecules dissolved in helium nanodroplets. The alignment sharpens as the laser intensity is increased, similar to the behavior in gas phase. For diiodobenzene the highest degree of alignment, ⟨cos2θ2D⟩=0.90, is essentially identical to the value obtained for isolated molecules in a supersonic beam, whereas the highest degrees of alignment for iodobenzene and for methyliodide in helium droplets fall below the values obtained for isolated molecules. We believe this is due to the deviation from axial recoil in the Coulomb explosion process that probes the alignment of the molecules in the He droplets.
The purpose of this article is to discuss different approaches in the values-based culture literature and identify research challenges and inconsistencies regarding the topic. From this, the authors develop applicable recommendations for scientists and managers. The study is based on an intense literature review on values, their definition, their measurement and management. These aspects are linked to each other in a further step. The authors link different perspectives on definition, measurement, analysis, and the management of values to a comprehensive picture. The measurement of values is seen to be a basis for the ability to be clear in communication, to monitor congruencies between beliefs and practices and to integrate personal values and the ethical framework of the company. The target of managing values is to be seen in a successful implementation into the organisation, as well as the P-O-fit (Person-Organisation fit) thought. In conclusion, the authors recommend to measure and to be aware of both, management values and employee values, in order to optimize the P-O fit and make values contribute to strategic goals. The article shows a way forward to a deeper understanding of the phenomenon of organisational values for business managers and scientists. The authors develop a common threat for a coherent picture on the definition, the method of measurement and the approach to management of values, which contributes to applicable recommendations for scientists and managers. Moreover, the article provides a platform for further research and empirical testing.
In today’s business practice, but also in academic research the aspect of competencies has gained remarkable importance. Competencies are not only a central part of the strategy process of a company. Corporate Strategy literature states that that human asset in particular can fulfil the criterion ’of a sustainable competitive advantage’ (Storey, 2007). The utilization of competencies is a key target of companies, as it is important in realizing a full return on investment. The paper analyses the state-of-the-art of competence theories with a specific recognition to the aspect of social capital. The author argues that the management of company competencies is a contributor to the utilization of competencies and links these aspects to social capital. In order to achieve the main goal of the underlying work the paper is structured as follows: first, the presentation of the state of the art in the area of competencies and social capital based on literature review; afterwards, the discussion is made in order to prove the main hypothesis. As a result the author concludes with a model showing the key bond between company competencies, individual competencies and social capital. With this, the paper contributes to a deeper understanding of the phenomenon of competencies for business managers and scientist. The findings are valuable to contribute to the utilization of individual competencies especially in the prism of social capital which will pay off for industrial companies and employees in long term. This is especially valid in an environment of skilled worker shortage.
We show that a 450 fs nonresonant, moderately intense, linearly polarized laser pulse can induce field-free molecular axis alignment of methyliodide (CH3I) molecules dissolved in a helium nanodroplet. Time-resolved measurements reveal rotational dynamics much slower than that of isolated molecules and absence of the sharp transient alignment recurrences characteristic of gas phase molecules. Our results presage a range of new opportunities for exploring both molecular dynamics in a dissipative environment and the properties of He nanodroplets.
The spectroscopy of molecules doped into superfluid helium droplets provides information on both, the dopant molecule and the helium environment. Electronic spectra of 9,10-dichloroanthracene in helium droplets are presented and compared with corresponding gas phase spectra to unravel the influence of the helium environment. The combined investigation of fluorescence excitation and dispersed emission provides information on dynamic processes in addition to energetic conditions. For vibronic states, the helium induced decay channels dominate over all intramolecular channels that contribute to the gas phase behavior. In addition to the triplet splitting caused by the Cl isotopes, a fine structure resolved for all transitions in the fluorescence excitation spectrum was found, which is the signature of microsolvation of this compound in helium droplets. This fine structure is identified as a single pure molecular transition accompanied by a sharply structured phonon wing. The corresponding fine structure measured for bare anthracene shows remarkable differences.
Alleinerziehende
(2013)
Familienpolitik
(2013)