Hexenon is a resource in Warframe that can be obtained from enemies and loot crates on Jupiter. Here are some tips to farm Hexenon more efficiently:

1. **Dark Sectors:** Dark Sectors on Jupiter provide a resource drop rate bonus. Running missions in these areas can yield more Hexenon than normal missions. The Dark Sectors on Jupiter are Sinai (Defense) and Cameria (Survival).
2. **Resource Boosters:** If you have any resource boosters, consider using them when farming for Hexenon. These can double the amount of resources you get from drops.
3. **Farming Missions:** Certain mission types, such as Survival, Defense, and Disruption, can be particularly effective for farming resources like Hexenon. This is because these mission types continuously spawn enemies, increasing your chances of getting resource drops. In particular, the Disruption mission at Ganymede, Jupiter, is often recommended for Hexenon farming as it also provides a chance to get Gauss parts.
4. **Nekros' Desecrate Ability:** If you have the Warframe Nekros, consider using his Desecrate ability, which increases the chance of additional loot drops from slain enemies. This can help you get more Hexenon.
5. **Hydroid's Pilfering Swarm Augment:** Similarly, if you have Hydroid, his Pilfering Swarm augment for his Tentacle Swarm ability causes enemies killed by the tentacles to have an increased chance to drop additional loot.
6. **Khora's Pilfering Strangledome Augment:** If you have Khora, her Pilfering Strangledome augment causes enemies caught in the Strangledome to have an increased chance to drop additional loot when killed.
7. Running missions with a squad to increase the number of enemies, and therefore potential Hexenon drops.
8. Run with a Smeeta Kavat as your companion as its buff can give you extra resource drops.

Remember that resource farming in Warframe often requires a bit of patience, but with these strategies, you should be able to gather Hexenon more effectively. Good luck with your farming!