Research Highlights
(1) Atomic and Molecular Processes in Plasmas and Plasma Chemistry \ Diagnostics, Material Processing, Laser Source and Atmospheric Environment

By means of an arc jet generator, or a microwave discharge apparatus, etc. (whatever plasma generator is O.K.), we study fundamentals and applications of atomic and molecular processes in plasmas and plasma chemistry. Particularly, we concentrate on development of OES measurement of molecular gas discharge plasmas.

For example, we demonstrated calculation of 1PS of N2 plasma based on theoretical molecular spectroscopy. We can extract atomic line of nitrogen, which enables actinometer measurement of N-atom density in the plasma. By this method, we also find marked enhancement in nitrogen dissociation degree with neon gas admixture. Recently, InTech - Open Access Publisher contacted me to publish a chapter to a textbook, "Chemical Kinetics". Consequently, I can manage to publish the recent progress of atomic and molecular processes in nitrogen plasma and its spectroscopic diagnostics. Please download it and understand a part of our study. Itfs FREE.

Hiroshi Akatsuka, Progresses in Experimental Study of N2 Plasma Diagnostics by Optical Emission Spectroscopy, Chemical Kinetics, Chapter 13, InTech - Open Access Publisher, pp. 283-308, Feb. 2012.

On Feb. 21, 2015, an E-mail was sent to me, which told that the article above had been downloaded 4,000 times. And, on Dec. 14, 5,000 times.

gDear Prof. Akatsuka,
We are pleased to inform you that your paper "Progresses in Experimental Study of N2 Plasma Diagnostics by Optical Emission Spectroscopy" has achieved impressive readership results. The chapter you have published with InTech in the book "Chemical Kinetics" has so far been accessed 5000 times. Congratulations on the significant impact that your work has achieved to date.

We congratulate you once again on your success.

InTech Author Statsh

How encouraging!

(2) Plasma Physics at Open-Field-Lines \ Study on Supersonic Acceleration, Mechanisms of Electric potential Formation and Rarefied Plasma Flow

We are studying flowing characteristics of plasmas at open-field-line both experimentally and theoretically, which is fundamentally crucial in various scientific and engineering applications like thrusters of artificial satellites, boundary domain of magnetic confinement thermonuclear fusion plasmas, or ionosphere plasmas. We apply plasma wind tunnel for experimental studies, and adopt particle simulation in numerical studies. A few of our recent progress in this field are the following:

Kazuyuki Yoshida, Tomohiko Shibata, Atsushi Nezu, Haruaki Matsuura and Hiroshi Akatsuka; gIon Acceleration in Arc Jet Plasma along Open Field Linesh, IEEE TRANSACTIONS ON PLASMA SCIENCE, IEEE, Vol. 37, No. 8, pp. 1414-1418, Aug. 2009.

Yoh Nagahara, Hiroki Ichii, Kazuyuki Yoshida, Atsushi Nezu, Haruaki Matsuura and Hiroshi Akatsuka; gCharacteristics of Cold Argon Arc-Jet Plasma Flowing Along Open-Field-Line and the Effects of Collisions on Decelerationh, IEEE TRANSACTIONS ON PLASMA SCIENCE, IEEE, Vol. 41, No. 8, pp. 1869-1877, Aug. 2013.

Satoshi Tsuno, Takeshi Nakahagi, Ryutaro Yamashiro, Atsushi Nezu, Haruaki Matsuura and Hiroshi Akatsuka; gNumerical Study on Acceleration and Deceleration Mechanism of Weakly Ionized Plasma Flowing Supersonically Through Open Field Line h, IEEE TRANSACTIONS ON PLASMA SCIENCE, IEEE, Vol. 42, No. 12, pp. 3732-3741, Dec. 2014.

(3) Local Structural Analyses of Molten Salts, Particularly Rare-Earth Fluorides, and Electrochemistry of Fluorides

Assistant Professor Haruaki Matsuura, a former colleague of my Lab., majors in molten salt chemistry, i.e., fundamentals of ions behavior in liquid phase. The local structural analyses of molten salts have been carried out in order to develop electrochemical and/or thermophysical processes. Recently, the methods using synchrotron radiation X-rays (particularly, EXAFS), together with molecular dynamic simulation as theoretical study, on several molten mixtures have been performed in collaboration with British and French scientists to investigate physico-chemical behaviour of cations and anions in molten salts. One of our recent progress in this field is the following as a kind of review:

Haruaki Matsuura, Sou Watanabe, Hiroshi Akatsuka, Yoshihiro Okamoto and Ashok K. Adya; XAFS analyses of molten metal fluorides, Journal of Fluorine Chemistry, Elsevier, Vol. 130, pp. 53-60, Jan. 2009.

Now Professor Haruaki Matsuura moved to Tokyo City University as an associate professor, but we will continue our collaboration.