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• W4284977457 abstract "The hyperfine structures of the P(57)45-0, P(91)48-0, and R(73)46-0 lines of molecular iodine ( <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:msup> <mml:mrow class=MJX-TeXAtom-ORD /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>127</mml:mn> </mml:mrow> </mml:msup> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>I</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> ) at 514 nm were studied using third-harmonic generation of a 1542 nm external-cavity diode laser and Doppler-free spectroscopy. The frequencies of the 1542 nm diode laser locked to the hyperfine transitions of these iodine lines are close to those of the P(16) transition in the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi>ν<!-- ν --></mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:mrow> <mml:mo>+</mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi>ν<!-- ν --></mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> band of acetylene ( <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:msup> <mml:mrow class=MJX-TeXAtom-ORD /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>13</mml:mn> </mml:mrow> </mml:msup> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>C</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>H</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> ), which is used as a wavelength standard for telecom applications. The absolute frequencies of the observed 59 iodine hyperfine transitions were determined with an uncertainty of 5.4 kHz (fractional uncertainty of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>9.3</mml:mn> </mml:mrow> <mml:mo>×<!-- × --></mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msup> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>−<!-- − --></mml:mo> <mml:mn>12</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> ). Highly accurate hyperfine constants were obtained through fitting of the measured hyperfine splittings to a four-term Hamiltonian that includes electric quadrupole, spin–rotation, tensor spin–spin, and scalar spin–spin interactions with an uncertainty of a few kHz. The observed hyperfine transitions provide wavelength standards for telecom applications with various optical frequencies and reduced uncertainties compared with the acetylene wavelength standard." @default.
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• W4284977457 date "2022-07-29" @default.
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• W4284977457 title "Hyperfine structure and absolute frequency of ¹²⁷I₂ transitions at 514 nm for wavelength standards at 1542 nm" @default.
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