Low-J Transitions in 
	    A˜2Π(0,0,0)−X˜2Σ+(0,0,0)
	   Band of Buffer-gas-cooled CaOH

Takahashi, Yuiki; Baba, Masaaki; Enomoto, Kazuki; Hiramoto, A.; Iwakuni, Kana; Kuma, Susumu; Tobaru, Reo; Miyamoto, Yuki

doi:10.3847/1538-4357/ac87fb

Cited by 4 publications

(6 citation statements)

References 41 publications

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“…The experimental setup depicted in Figure is the same as that reported in a previous study, , except for the addition of laser beams for saturation spectroscopy. The copper buffer gas cell is fixed to the cooling stage of a pulse-tube refrigerator (Sumitomo Heavy Industries, SRP-062B).…”

Section: Experimental Methodsmentioning

confidence: 99%

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Doppler-free Spectroscopy of Buffer-Gas-Cooled Calcium Monohydroxide

et al. 2023

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In this study, we report the Doppler-free spectra of buffer-gas-cooled CaOH. We observed five Doppler-free spectra containing low-J Q 1 and R 12 transitions, which were only partially resolved by previous Doppler-limited spectroscopies. The spectra frequencies were corrected using the Doppler-free spectra of iodine molecules; accordingly, the uncertainty was estimated to be below 10 MHz. We determined the spin−rotation constant in the ground state, which agrees with the values reported in the literature obtained based on millimeter-wave data within 1 MHz. This suggests that the relative uncertainty is much smaller. The present study demonstrates the Doppler-free spectroscopy of a polyatomic radical and the broad applicability of the buffer gas cooling method to molecular spectroscopy. CaOH is the only polyatomic molecule that can be directly laser-cooled and trapped in a magneto-optical trap. High-resolution spectroscopy of such molecules is useful for establishing efficient laser cooling schemes of polyatomic molecules.

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Section: Experimental Methodsmentioning

confidence: 99%

“…Slow beam velocities in the laboratory frame and a wide applicable temperature range are important characteristics of buffer gas cooling. Currently, numerous spectroscopic studies using buffer gas cooling have been reported. − …”

Section: Introductionmentioning

confidence: 99%

Doppler-free Spectroscopy of Buffer-Gas-Cooled Calcium Monohydroxide

et al. 2023

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“…The buffer-gas cell used in this study was the same as used in Ref. [20], to which we added counter-propagating probe lasers. Figure 1 shows our measurement setup.…”

Section: Methodsmentioning

confidence: 99%

“…The complex dynamics affects observed spectra, resulting in a systematic uncertainty as observed in Ref. [20]. Therefore, careful treatment of this effect is required for precision spectroscopy.…”

Section: Introductionmentioning

confidence: 94%

“…However, the major advantage of probing molecules inside a cell in spectroscopy is the generation of high-intensity signals owing to higher molecule density inside a cell than that outside it. Thus far, spectroscopies of calcium monohydroxide molecules ( 40 Ca 16 O 1 H) [20] and free-base phthalocyanin [21] have been conducted inside a cell. In these studies, helium was used as the buffer * miyamo-y@cc.okayama-u.ac.jp gas, and the target molecules were provided by laser ablation.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Doppler effects in cryogenic buffer-gas cell

Hiramoto¹,

Baba²,

Enomoto³

et al. 2022

Preprint

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Buffer-gas cooling is a universal cooling technique for molecules and used for various purposes. One of its applications is using molecules inside a buffer-gas cell for low-temperature spectroscopy. Although a high-intensity signal is expected in the cell, complex molecular dynamics is a drawback for precise spectroscopy. In this study, we performed high-resolution absorption spectroscopy of low-J transitions in the Ã2 Π(0, 0, 0) − X2 Σ + (0, 0, 0) band of calcium monohydroxide (CaOH). CaOH molecules were produced by laser ablation in a copper cell and cooled to ∼5 K using helium buffer gas. We probed the Doppler effects in a buffer-gas cell by injecting counter-propagating lasers inside the cell. The time evolutions of the Doppler width and shift were simulated using a dedicated Monte Carlo simulation and compared with data.

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Analysis on high-resolution spectrum of the S1–S0 transition of free-base phthalocyanine

Miyamoto,

Hiramoto,

Iwakuni

et al. 2024

The Journal of Chemical Physics

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A high-resolution absorption spectrum of the S1–S0 transition of free-base phthalocyanine was observed and analyzed with improved reliability. The spectrum, with a partially resolved rotational structure, was obtained by using the buffer-gas cooling technique and a single-mode tunable laser. Our new analysis reveals that the S1←S0000 band belongs to the a-type transition, where the electronic transition moment aligns parallel to the NH–HN direction, allowing the assignment of the S1 state to 1B3u. These results agree with a prior study using supersonic expansion and are well supported by theoretical calculations. Interestingly, the rotational constant B in the S1 state, which is often smaller than that in the ground state for typical molecules, was found to be slightly larger than that in the S01Ag state. This suggests a change in the character of π bonds with the electronic excitation.

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Low-J Transitions in A˜2Π(0,0,0)−X˜2Σ+(0,0,0) Band of Buffer-gas-cooled CaOH

Cited by 4 publications

References 41 publications

Doppler-free Spectroscopy of Buffer-Gas-Cooled Calcium Monohydroxide

Doppler-free Spectroscopy of Buffer-Gas-Cooled Calcium Monohydroxide

Measurement of Doppler effects in cryogenic buffer-gas cell

Analysis on high-resolution spectrum of the S1–S0 transition of free-base phthalocyanine

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