 |
 |
 |
 |
 |
 |
Sains Malaysiana 43(4)(2014): 637–642
Determination of Potential Curves of Br2 in Franck-Condon's Region (Penentuan Potensi Lengkung Br2 di Rantau Franck-Condon)
EDO S. JANIC1, VLADIMIR
BUTIGAN1, JASMINA
DJ.
NOVAKOVIC2* & MILENA LEKIC1
1Faculty of Physics, University of Belgrade,
Studentski trg, 11000 Belgrade, Serbia
2Graduate School of Computer Sciences, Megatrend University,
Bulevar Umetnosti 29 11000 Belgrade, Serbia
Diserahkan: 7 Mei 2012/Diterima: 7 Ogos 2013
ABSTRACT
The extinction of Br2
molecules in gas state is measured
for different wavelengths of incident light in interval of 370 –
570 nm by method of gas spectroscopy. The measurement is made on
the basis of Franck-Condon's principle, under which a transition
to a more excited state is done without changing the intercore distance
(in further text, R). The graph of energy dependence on extinction
is drawn. On the graph are recognized two Gausses slopes and their
separation (deconvolution) is done. The complete Gausses functions
are determined on graph. The method of mirror symmetry is applied
on Gausses slopes of extinction and symmetrical extinction values
(Es) are obtained. Borders of Franck-Condon’s area are determined
from ground state of Linear Harmonic Oscillator (LHO).
Tables of dependence on R and the excitation energy are given. On
the basis of these tables are drawn potential curves of electron
energy E(R) in excited electronic states of Br2 molecules as functions of R in Franck-Condon's
area.
Keywords: Br2; extinction; Franck-Condon's
region; intercore distance; potential curve
ABSTRAK
Kepunahan molekul Br2
dalam keadaan gas diukur dengan jarak
gelombang yang berbeza cahaya tuju dalam tempoh daripada 370-570
nm dengan menggunakan kaedah gas spektroskopi. Pengukuran ini dibuat
berdasarkan prinsip Franck-Condon dengan peralihan kepada keadaan
teruja dilakukan tanpa menukar jarak antara teras (dalam teks seterusnya,
R). Graf tenaga pergantungan kepada kepunahan dilukis. Di dalam
graf tersebut, dua cerun Gausses dan pemisahan mereka (deconvolution)
dilakukan. Fungsi Gausses yang lengkap ditentukan pada graf. Kaedah
cermin simetri digunakan pada cerun Gausses kepunahan dan nilai
kepunahan simetri (Es) diperoleh. Kawasan sempadan Franck-Condon
ditentukan daripada keadaan asas daripada Pengayun Harmonik Linear
(LHO). Jadual pergantungan R dan tenaga pengujaan diberi.
Berdasarkan jadual ini, lengkung potensi tenaga elektron E(R) akan
dilukis dalam keadaan elektronik teruja molekul Br2 sebagai
fungsi R di kawasan Franck-Condon.
Kata kunci: Br2;
jarak antara teras; kepunahan; potensi lengkung; rantau Franck-Condon
RUJUKAN
Asano, Y. & Yabushita, S.B. 2003. Rotational state
distributions of I2(B) from vibrational
predissociation of I2(B)-Ne. Korean
Chem. Soc. 6: 24-703.
Barrow, G.M. 1962. Molecular Spectroscopy. New York:
McGraw Hill.
Coxon, J.A. 1972. Franck-Condon factors and R-centroids for
halogen molecules—III. The A3Π(1)-X1Σ+
system of 79Br81Br. Journal of Molecular Spectroscopy 41(3) 566-576.
Coxon, J.A. 1971. The calculation of potential energy curves
of diatomic molecules: Application to halogen molecules. J. Quant.
Spectrosc. Radiat. Transfer 11(5): 443-462.
Huber, K. & Herzberg, P.G. 1979. Constants of
Diatomic Molecules. New York: Van Nostrand Reinhold.
Li, J. & Balasubramanian, K. 1989. Spectroscopic
properties and potential energy curves of I2 and
I2+. J. Mol. Spectrosc. 138(1): 162-180.
Lindeman,
T.G. & Wiesenfeld, J.R. 1979. Photodisosiation of Br2 in
the visible continuum. J. Chem.Phys. 70(6): 2882.
Morse, P.M. 1929. Diatomic
molecules according to the wave mechanics. II. Vibrational Levels. Phys.
Rev. 34: 57-64.
Teichteil, C. & Pelissier, M. 1994. Relativistic
calculations of excited states of molecular iodine. Chem. Phys. 180(1):
1-18.
*Pengarang untuk surat-menyurat; email: jnovakovic@megatrend.edu.rs
|
|||
|
