[1] S. Jochim et al., Science 302 (2003) 2101.
[2] R. Teets, R. Feinberg, T. W. Hansch, A. L. Schawlow: Phys. Rev. Lett., 37 (1976) 683.
[3] M. M. Kappe et al, Chem. Phys. Lett.,107 (1984) 6.
[4] C.E. Fellows, J. Chem. Phys., 94 (1991) 5855; J. Mol. Spectrosc, 136 (1989) 369.
[5] C.E. Fellows, J.Vergès, and C. Amiot, J. Chem. Phys., 93 (1990) 6281-6290.
[6]. W. Jastrzębski et al, Spectrochim. Acta, Part A, 58A (2002) 2193.
[7] I. D. Petsalakis et al., Chem. Phys., 362 (1999) 130.
[8] Nguyen Huy Bang et. al. J. Mol. Spectr. 233 (2005) 290; Optica. Applicata. 36 No4 (2006) 499; Chem. Phys. Lett. 440 (2007) 199; Opt. Mat. 31(2009) 527; J. Chem. Phys. 130 (2009) 124307.
PB-33.
|
Experimental determination of molecular constants for the 2^1П state of NaLi
Dinh Xuan Khoa(1), Le Canh Trung(1), Le Thi Minh Phuong(2), and Nguyen Huy Bang (1)
(1) Vinh University, 182 Le Duan Street, Vinh City, Vietnam
(2) Phu Lam Technology Economic College, 215 Nguyen Van Luong street, Ho Chi Minh City
The alkali-metal diatomic molecules with their main absorption bands in the UV-VIS region are very convenient for modern laser spectroscopy techniques. Experimental investigations for these molecules have further promoted since the emergence of molecular Bose-Einstein condensates (see [1] and references therein). As several experimental techniques related to cold molecules involve optical excitation either in the formation or detection stages, an accurate need of precise spectroscopic characterization of excited molecular states has arisen.
Among alkali-metal diatomic molecules, NaLi is particularly interested because it is the lightest hetero-nuclear type and has permanent dipole moment, thus can be manipulated with external electric fields. Several experimental investigations for NaLi were performed to study up to the 71Π excited states [2-7]. Although the 21 state was investigated [4] but its rotational characterization was not described due to low resolution of experimental data.
In this work, we determinate molecular constants for the 21Π state of NaLi from set of 732 spectral lines [8]. Using the linear least-squares fitting method, an optimum set of molecular constants, which corresponds to dimensionless root mean of squares of deviation  = 0.62 within 0.1 cm-1 experimental uncertainty, have been derived.
References
[1] S. Jochim et al., Science 302 (2003) 2101.
[2] C.E. Fellows, J. Chem. Phys., 94 (1991) 5855; J. Mol. Spectrosc, 136 (1989) 369.
[3] C.E. Fellows, J.Vergès, and C. Amiot, J. Chem. Phys., 93 (1990) 6281-6290.
[4] M. M. Kappe, K. O. Marti, P. Radi, M. Schäp, and E. Scgumacher, Chem. Phys. Lett.,107 (1984) 6.
[5]. W. Jastrzębski, P. Kowalczyk, R. Nadyak, and A. Pashov, Spectrochim. Acta, Part A, 58A (2002) 2193.
[6] I. D. Petsalakis et al., Chem. Phys., 362 (1999) 130.
[7] Nguyen Huy Bang et. al. J. Mol. Spectr. 233 (2005) 290; Optica. Applicata. 36 No4 (2006) 499; Chem. Phys. Lett. 440 (2007) 199; Opt. Mat. 31(2009) 527; J. Chem. Phys. 130 (2009) 124307.
[8] Le Canh Trung et al. “First rotational spectroscopic observation of the 21П state of NaLi”, paper at this Conference.
|
PB-34.
|
Population density distribution of vibrational levels in the 2^1П state of NaLi molecule
Nguyen Tien Dung, Le Canh Trung, Nguyen Van Thinh, Hoang Cong Vieng, Le Hong Quang, Phan Van Thuan, Vu Ngoc Sau, Doan Hoai Son, Dinh Xuan Khoa, and Nguyen Huy Bang
Vinh University, 182 Le Duan Street, Vinh City, Vietnam
The advent of femto-second laser spectroscopy techniques opens ways to explore dynamical processes in molecules after optical excitations. The molecular dynamics has been now an interesting field for spectroscopists, biologists, and chemists in order to understand intermolecular/intramolecular transitions. As in experiments concerning to molecular dynamics, the population distribution of vibrational levels in the excited electronic states is crucial information for setting parameters [1]. Recently, alkali-metal diatomic molecules are particular interested for this kind of spectroscopic experiment because of their simple electronic structure and their spectra lying in UV-VIS region, which is easily excited by commercial laser sources. Therefore, knowing of vibrational population characterization for this kind of molecules is needed.
In this work, we calculate population density of vibrational levels up to the near dissociate limit of the 21 of NaLi by using Numerov-Cooley method [2]. The confidence of calculation is tested by comparing Franck-Condon factors to the experimental spectra of 2111+ band system [3].
|
Chia sẻ với bạn bè của bạn: |
