Constantine and his Relationship with Science/Physics

I knew very little about this stuff other than what Constantine shared with me during our talks. I had seen a few room sized machines he had built during a tour at a Lab. I have always found this stuff very interesting and myself and Constantine always tried to find a way to bring science and music together. Molecular Music was something we talked about a lot.

Doing a quick search under the name gets you to the Mircosoft Academic Links and point to a few articles published by Constantine including some 42 citations and 9 major publications. Follow the link below to make your own search within the academia directory.

http://academic.research.microsoft.com/Search?query=Constantine%20Douketis

 Constantines listing as a graduate of Prinston

http://www.princeton.edu/~chemdept/Scoles/SCOLES%20NEW/Scolessite/teachinggs.html

Below i have listed the first page of search results and copied to the web page. There are 28 articles in all.

For more info on the substance of the article you can click on the DOI number at the bottom of each publication.

Fractal character of cold-deposited silver films determined by low-temperature scanning tunneling microscopy  

High-resolution scanning-tunneling-microscope (STM) topographic images of vacuum-deposited Ag films are reported. Films were formed and imaged at 100 and 300 K. Images of films deposited at 300 K, annealed to 560 K, and then returned to 300 K are also presented. The topographic surfaces of the low-temperature films are found to be self-affine fractals with a local Hausdorff-Besicovitch dimension D=2.5. The low-temperature films exhibit intense surface-enhanced Raman spectra (SERS). Films deposited at 300 K do not possess significant fractal character and are not SERS active. We show that the apparent local fractal dimension obtained by analyzing STM topographic images depends critically on the algorithm used. Three such methods (cube counting, triangulation, and power spectrum analysis) are assessed. A method is proposed for obtaining reliable fractal dimensions by analyzing the experimental STM topographic images using several algorithms and comparing the results to a calibration curve generated by applying the same algorithms to simulated fractal surfaces of known Hausdorff-Besicovitch dimension.
Journal: Physical Review B - PHYS REV B , vol. 511, no. 16, pp. 1114669-11031, 1995

 Synthesis and resonance Raman spectroscopy of CdS nano-wire arrays  

Highly anisotropic arrays of aligned semiconductor nano-wires with diameters in the range 9–22 nm and lengths up to 1 μm were fabricated by electrodepositing CdS into the pores of anodic aluminum oxide. The value of the exciton energy of the semiconductor nano-wires was determined as a function of wire diameter from the excitation wavelength dependence of their polarized resonance Raman spectra in the vicinity of the CdS absorption edge. The resonance Raman (RR) spectra were dominated by a progression in the longitudinal optical phonon mode. The relative intensities of the members of the progression are both excitation-wavelength and particle-size dependent. The LO phonon frequency was also found to be wire-diameter dependent. The RR spectra were found to be almost independent of the polarization of the light exciting them. The optical exciton energy was determined to vary from 2.36 eV for the largest diameter wires to 2.42 eV for the smallest. The absence of polarization dependence is interpreted to be in part due to the fact that the nano-wires consist of strings of semiconductor crystallites so that the local aspect ratio of the crystallites is both not very great and not uniform in the axial direction. For the smallest nano-wires the radial size uniformity is, however, very high. The dependence of the band-gap energy on the diameter of the nano-wires is in good agreement with theory.
Journal: Chemical Physics - CHEM PHYS , vol. 210, no. 1, pp. 343-352, 1996

Mode localization in self-affine fractal interfaces observed by near-field microscopy  

Near-field optical microscopy with simultaneous topographic imaging shows that for a given excitation wavelength the electromagnetic optical fields excited in a self-affine film are highly localized at ``hot spots'' whose dimensions are often smaller than the wavelength. The pattern of hot spots varies greatly with excitation wavelength and does not correlate simply with the film topography. This observation is consistent with a recent theory of the optical response of self-affine fractal objects and also indicates that the locus of optical effects such as surface-enhanced Raman does not reside in special surface sites such as interstices. Additionally, we show that the conclusions of the theory, which was based on a quasilocal approximation, are qualitatively valid for self-affine films considerably larger than the exciting optical wavelength.
Journal: Physical Review B - PHYS REV B , vol. 571, no. 24, pp. 87315-15518, 1998

State-resolved rotational relaxation of methyl fluoride in the free-jet expansion of methyl fluoride-helium mixtures

Journal: The Journal of Physical Chemistry , vol. 88, no. 20, pp. 4484-4487, 1984

Rough silver films studied by surface enhanced raman spectroscopy and low temperature scanning tunnelling microscopy

The surface topography of Ag films and surface enhanced Raman scattering (SERS) from benzene on Ag films have been simultaneously recorded. The Ag films were formed by vacuum deposition at temperatures ranging from 100 K to 500 K. Analysis of scanning tunnelling microscopy (STM) images shows that films formed below 250 K are fractal structures with Hausdorff-Besicovitch dimension 2.55
Journal: Progress in Surface Science - PROG SURF SCI , vol. 50, no. 1, pp. 187-195, 1995

Vibrational spectroscopy of hydrogen cyanide clusters  

 Two-photon electron emission from smooth and rough metal films in the threshold region  

Two-photon photoemission spectra are reported for silver films deposited under ultrahigh vacuum onto a room-temperature (smooth film) or a cold substrate (rough film). A theory is developed which successfully accounts for the qualitative features of the observed spectra in the near-threshold region when the Ag is excited by the absorption of one or two photons. Photoemission from smooth films can be successfully described in terms of direct electron transitions. The traditional one-photon photoemission theory is generalized to include two-photon excitation. Photoemission from rough Ag surfaces is interpreted in terms of the excitation of localized surface plasmons in the roughness features which are assumed to be small polarizable elements of a self-affine fractal. The rapid spatial rate of change in the local electric field surrounding these elements breaks translational invariance, thereby allowing indirect electron transitions to take place, ultimately leading to a predicted (103-106)-fold enhancement of the two-photon photoemission yield. Approximate analytic expressions are derived for the total photoemission yields following one- or two-photon excitation of smooth silver and two-photon excitation of rough silver.
Journal: Physical Review B - PHYS REV B , vol. 531, no. 16, pp. 70035-11206, 1996

Light-induced kinetic effects in solids  

The role of localized surface plasmons in photoemission from silver films: Direct and indirect transition channels