Mapping Interstellar Ice Inventory toward Class 0 Protostars in Star-forming Region Orion A with JWST Data: Laboratory ice analogue IR spectra

The laboratory spectra of CH3OH (at 10~K) and NH4+OCN- (at 10 K and 120 K) obtained with the ISEAge using transmission method (Ozhiganov et al. 2024).The pure CH3OH was deposited at a rate of 1.43×10^13 molecules cm^−2 s^−1 for 60 minutes onto a germanium substrate cooled to 10 K, resulting in a total column density of 5.15×10^16 cm−2. Following the deposition, the IR spectrum of the CH3OH ice was recorded with 128 scans. The spectra of the NH4+ OCN− salt (the product of the NH3 + HNCO = NH4+ OCN− reaction) were obtained by co-depositing ammonia (NH3) and HNCO onto a 10 K substrate. Deposition rates were 5.50×10^13 molecules cm−2 s−1 for NH3 and 2.37×10^13 molecules cm^−2 s^−1 for HNCO, supported for 30 minutes. The resulting ice contained NH3, HNCO, and NH4+ OCN− in a molecular ratio of 6:1:3, determined from the NH3 umbrella band (with the band strength of A’=1.95×10^−17 cm, Hudson et al. 2022), the HNCO band (A’=1.29×10^−16 cm, Hudson et al. 2024), and the OCN− band (A’=1.5×10^−16 cm, Gerakines et al. 2025). Subsequently, we heated the ice at a rate of 5 K min−1 to 200 K while continuously collecting IR spectra with 32 scans per spectrum, which corresponds to an averaging of 45 seconds.本数据集包含利用ISEAge通过透射法获取的甲醇（CH3OH，10 K条件下）与氰酸铵（NH4+OCN-，10 K与120 K条件下）的实验室光谱（Ozhiganov等，2024）。纯甲醇以1.43×10^13 分子·厘米^−2·秒^−1的沉积速率在冷却至10 K的锗衬底上沉积60分钟，最终得到的总柱密度为5.15×10^16 厘米^−2。沉积完成后，以128次扫描参数采集该甲醇冰的红外（IR）光谱。氰酸铵盐（由NH3 + HNCO = NH4+OCN−反应生成）的光谱通过将氨气（NH3）与异氰酸（HNCO）共沉积至10 K的衬底上获取。氨气与异氰酸的沉积速率分别为5.50×10^13 分子·厘米^−2·秒^−1与2.37×10^13 分子·厘米^−2·秒^−1，该沉积过程持续30分钟。最终得到的冰样中包含NH3、HNCO与NH4+OCN−，其分子比为6:1:3，该比例通过氨气伞式振动带（谱带强度A’=1.95×10^−17 厘米，Hudson等，2022）、异氰酸特征带（A’=1.29×10^−16 厘米，Hudson等，2024）以及氰酸根（OCN−）特征带（A’=1.5×10^−16 厘米，Gerakines等，2025）测定得到。随后，我们以5 K·分钟^−1的升温速率将该冰样加热至200 K，期间以每谱32次扫描的参数持续采集红外光谱，单次采集的平均时长为45秒。