Measurement of Doppler effects in a cryogenic buffer-gas cell

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

doi:10.1103/physreva.107.043114

Cited by 3 publications

(6 citation statements)

References 27 publications

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“…Time-varying complex flow in the cell, however, makes the average non-zero and causes time-varying shift. This effect increases an error in the transition frequency by approximately 10 MHz . The small uncertainty in the present study occurs owing to both the narrow Doppler-free linewidth and its insensitivity to the dynamics in the cell.…”

Section: Resultsmentioning

confidence: 70%

“…This effect increases an error in the transition frequency by approximately 10 MHz. 39 The small uncertainty in the present study occurs owing to both the narrow Doppler-free linewidth and its insensitivity to the dynamics in the cell. The determined transition frequencies and linewidths were averaged over four measurements, listed in Table 1 and compared with previous Doppler-limited spectroscopy results.…”

Section: Resultsmentioning

confidence: 75%

“…In a previous study, we reported Doppler-limited spectroscopy of the A 2 Π−X 2 Σ + transition of CaOH cooled by a buffer gas 31 and investigated the cooling dynamics in the buffer gas cell by measuring the Doppler effect in terms of both shift and width. 39 These results underline the importance of Dopplerfree spectroscopy because the uncertainty in the transition frequency is limited by the Doppler width and shift. Herein, we report five spectra of the CaOH A (0, 0, 0)−X (0, 0, 0) transition, that is, the band origin transition.…”

Section: Introductionmentioning

confidence: 76%

“…The low- J transitions tend to have large widths. The pressure width was estimated to be less than 10 MHz (3.3 × 10 –4 cm –1 ) from the number density of helium in the cell of 5×10 15 cm –3 …”

Section: Resultsmentioning

confidence: 99%

“…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: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

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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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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