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High-precision spectroscopy of molec...

Chen, Lisheng.

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High-precision spectroscopy of molecular iodine: From optical frequency standards to global descriptions of hyperfine interactions and associated electronic structure.

Record Type:	Electronic resources : Monograph/item
Title/Author:	High-precision spectroscopy of molecular iodine: From optical frequency standards to global descriptions of hyperfine interactions and associated electronic structure./
Author:	Chen, Lisheng.
Description:	248 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1531.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Physics, Optics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168269
ISBN:	0542040514

High-precision spectroscopy of molecular iodine: From optical frequency standards to global descriptions of hyperfine interactions and associated electronic structure.
Chen, Lisheng.

High-precision spectroscopy of molecular iodine: From optical frequency standards to global descriptions of hyperfine interactions and associated electronic structure. - 248 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1531.

Thesis (Ph.D.)--University of Colorado at Boulder, 2005.

A widely tunable and high-resolution spectrometer based on a frequency-doubled Ti:sapphire laser is used to explore sub-Doppler transitions of molecular iodine in the wavelength range 523--498 nm. We investigate the natural width of the hyperfine components at various transitions and its wavelength dependence is mapped out in this region. The narrowest natural width observed is &sim;52 kHz near 508 nm. The observed excellent signal-to-noise ratio should lead to high-quality optical frequency standards that are better than those of the popular 532-nm system. In addition, we employ a self-referenced femtosecond optical comb to measure the absolute frequency of the length standard at 514.67 nm, which is based on the a3 hyperfine component of transition P(13) 43-0. This technique improves the precision of the frequency measurement by two orders of magnitude as compared with previous wavelength-based results.

ISBN: 0542040514Subjects--Topical Terms:

1018756
Physics, Optics.

High-precision spectroscopy of molecular iodine: From optical frequency standards to global descriptions of hyperfine interactions and associated electronic structure.
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035 $a (UnM)AAI3168269
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040 $a UnM $c UnM
100 1 $a Chen, Lisheng. $3 1903428
245 1 0 $a High-precision spectroscopy of molecular iodine: From optical frequency standards to global descriptions of hyperfine interactions and associated electronic structure.
300 $a 248 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1531.
500 $a Director: Jun Ye.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2005.
520 $a A widely tunable and high-resolution spectrometer based on a frequency-doubled Ti:sapphire laser is used to explore sub-Doppler transitions of molecular iodine in the wavelength range 523--498 nm. We investigate the natural width of the hyperfine components at various transitions and its wavelength dependence is mapped out in this region. The narrowest natural width observed is &sim;52 kHz near 508 nm. The observed excellent signal-to-noise ratio should lead to high-quality optical frequency standards that are better than those of the popular 532-nm system. In addition, we employ a self-referenced femtosecond optical comb to measure the absolute frequency of the length standard at 514.67 nm, which is based on the a3 hyperfine component of transition P(13) 43-0. This technique improves the precision of the frequency measurement by two orders of magnitude as compared with previous wavelength-based results.
520 $a The hyperfine spectra of B ← X transitions in the wavelength range 500--517 nm are investigated systematically. Four effective hyperfine parameters, eqQB, CB, dB, and delta B, are determined for an extensive number of rovibrational levels spanning the intermediate region 42 < upsilon' < 70 in the B0+u (3piu) state. Near vibrational levels upsilon ' = 57--60, the 1g( 1pig) electronic state strongly perturbs the B0+u (3piu) state through rotational coincidence, leading to effects such as abnormal variations in the hyperfine parameters and strong u-g mixing recorded at the transition P(84) 60-0. Various perturbation effects in the B0+u (3piu) state identified so far are summarized.
520 $a We have also performed a high-resolution analysis of the six electronic states that share the same dissociation limit with the excited electronic state B0+u (3piu) in molecular iodine. These six states are coupled to the B0+u (3piu) state via hyperfine interactions. The four hyperfine parameters are calculated using available potential energy curves and wave functions constructed from the separated-atom basis set. We obtain a maximum separation of the respective contributions from all six electronic states and compare each individual contribution with high-precision spectroscopic data, allowing an independent verification of the relevant electronic structure.
590 $a School code: 0051.
650 4 $a Physics, Optics. $3 1018756
650 4 $a Physics, Atomic. $3 1029235
650 4 $a Physics, Molecular. $3 1018648
690 $a 0752
690 $a 0748
690 $a 0609
710 2 0 $a University of Colorado at Boulder. $3 1019435
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Ye, Jun, $e advisor
790 $a 0051
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168269