Finland

  

Juhani KOIVISTO (20)

City/Region: Espoo
E-mail: gunilla.koivisto@keskiespoo.net
Hobbies: Judo, Piano, Role-playing, Cycling
Career: Researcher in Physics
School: Mattlidens Gymnasium

 
Determination of vibrational parameters B and X of iodine molecule

Through experimental modelling the spectroscopic fine structure of iodine has been estimated based on its absorption spectrum in the 480-650 nm region at 298 K. This information includes data for the molecules vibrational frequency, anharmonicity, dissociation energies, force constant, bond lengths, and population, among other parameters describing the molecular potential energy diagram. Moreover the experiment introduces techniques widely used in engineering and medical studies.
 


Petri VALKAMA (19)

City/Region: Jyväskylä
E-mail: vieru997@hotmail.com
Hobbies: Physics, Chemistry, Computer games, Role-playing
Career: Engineer
School: Jyväskylän Lyseon lukio

 
Analysis of the mass distribution of paper coatings

A method for analyzing the grammage and mass distribution of paper coatings with laser spectroscopy was developed. The coating was bored through with laser and its grammage was calculated from the number of pulses needed to pierce it. The mass distribution was analyzed by measuring the grammage in nearby points. A spectrum of the radiation emitted when the laser hit the coating was used to analyze its composition. The method identified the interface of the coating and the paper using their different composition. The error of the method was calculated. The method was found to be suitable for analysis of paper coatings with errors of 7,5%, reducible easily to 5,5% and even further. The method is best suited for measuring single coatings, although it can be used to measure double coatings as well. It can be used for both online and offline measurements.

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